Update README.md (#5466)

<!-- PR description-->

---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [ ] ⛔ No

#### Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic
words" - "closes, fixes" to auto-close the Github issue. -->
* #<issue>

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

.github/actions/backup-restore-test/action.yml

@@ -1,4 +1,5 @@
 name: Backup Restore Test
+description: Run various backup/restore/export tests for a service.
 
 inputs:
   service:

.github/actions/go-setup-cache/action.yml

@@ -1,4 +1,5 @@
 name: Setup and Cache Golang
+description: Build golang binaries for later use in CI.
 
 # clone of: https://github.com/magnetikonline/action-golang-cache/blob/main/action.yaml
 #

.github/actions/publish-binary/action.yml

@@ -1,4 +1,5 @@
 name: Publish Binary
+description: Publish binary artifacts.
 
 inputs:
   version:

.github/actions/publish-website/action.yml

@@ -1,4 +1,5 @@
 name: Publish Website
+description: Publish website artifacts.
 
 inputs:
   aws-iam-role:

.github/actions/purge-m365-data/action.yml

@@ -1,4 +1,5 @@
 name: Purge M365 User Data
+description: Deletes M365 data generated during CI tests.
 
 # Hard deletion of an m365 user's data.  Our CI processes create a lot
 # of data churn (creation and immediate deletion) of files, the likes
@@ -30,12 +31,19 @@ inputs:
     description: Secret value of for AZURE_CLIENT_ID
   azure-client-secret:
     description: Secret value of for AZURE_CLIENT_SECRET
+  azure-pnp-client-id:
+    description: Secret value of AZURE_PNP_CLIENT_ID
+  azure-pnp-client-cert:
+    description: Base64 encoded private certificate for the azure-pnp-client-id (Secret value of AZURE_PNP_CLIENT_CERT)
   azure-tenant-id:
-    description: Secret value of for AZURE_TENANT_ID
+    description: Secret value of AZURE_TENANT_ID
   m365-admin-user:
     description: Secret value of for M365_TENANT_ADMIN_USER
   m365-admin-password:
     description: Secret value of for M365_TENANT_ADMIN_PASSWORD
+  tenant-domain:
+    description: The domain of the tenant (ex. 10rqc2.onmicrosft.com)
+    required: true
 
 runs:
   using: composite
@@ -53,7 +61,13 @@ runs:
         AZURE_CLIENT_ID: ${{ inputs.azure-client-id }}
         AZURE_CLIENT_SECRET: ${{ inputs.azure-client-secret }}
         AZURE_TENANT_ID: ${{ inputs.azure-tenant-id }}
-      run: ./exchangePurge.ps1 -User ${{ inputs.user }} -FolderNamePurgeList PersonMetadata -FolderPrefixPurgeList "${{ inputs.folder-prefix }}".Split(",") -PurgeBeforeTimestamp ${{ inputs.older-than }}
+      run: |
+        for ($ATTEMPT_NUM = 1; $ATTEMPT_NUM -le 3; $ATTEMPT_NUM++)
+        {
+          if (./exchangePurge.ps1 -User ${{ inputs.user }} -FolderNamePurgeList PersonMetadata -FolderPrefixPurgeList "${{ inputs.folder-prefix }}".Split(",") -PurgeBeforeTimestamp ${{ inputs.older-than }}) {
+            break
+          }
+        }
 
     # TODO(ashmrtn): Re-enable when we figure out errors we're seeing with Get-Mailbox call.
     #- name: Reset retention for all mailboxes to 0
@@ -74,10 +88,16 @@ runs:
       shell: pwsh
       working-directory: ./src/cmd/purge/scripts
       env:
-        M365_TENANT_ADMIN_USER: ${{ inputs.m365-admin-user }}
+        AZURE_CLIENT_ID: ${{ inputs.azure-pnp-client-id }}
-        M365_TENANT_ADMIN_PASSWORD: ${{ inputs.m365-admin-password }}
+        AZURE_APP_CERT: ${{ inputs.azure-pnp-client-cert }}
+        TENANT_DOMAIN:  ${{ inputs.tenant-domain }}
       run: |
-        ./onedrivePurge.ps1 -User ${{ inputs.user }} -FolderPrefixPurgeList "${{ inputs.folder-prefix }}".Split(",") -PurgeBeforeTimestamp ${{ inputs.older-than }}
+        for ($ATTEMPT_NUM = 1; $ATTEMPT_NUM -le 3; $ATTEMPT_NUM++)
+        {
+          if (./onedrivePurge.ps1 -User ${{ inputs.user }} -FolderPrefixPurgeList "${{ inputs.folder-prefix }}".Split(",") -PurgeBeforeTimestamp ${{ inputs.older-than }}) {
+            break
+          }
+        }
 
     ################################################################################################################
     # Sharepoint
@@ -88,6 +108,14 @@ runs:
       shell: pwsh
       working-directory: ./src/cmd/purge/scripts
       env:
-        M365_TENANT_ADMIN_USER: ${{ inputs.m365-admin-user }}
+        AZURE_CLIENT_ID: ${{ inputs.azure-pnp-client-id }}
-        M365_TENANT_ADMIN_PASSWORD: ${{ inputs.m365-admin-password }}
+        AZURE_APP_CERT: ${{ inputs.azure-pnp-client-cert }}
-      run: ./onedrivePurge.ps1 -Site ${{ inputs.site }} -LibraryNameList "${{ inputs.libraries }}".split(",") -FolderPrefixPurgeList ${{ inputs.folder-prefix }} -LibraryPrefixDeleteList ${{ inputs.library-prefix && inputs.library-prefix || '[]' }} -PurgeBeforeTimestamp ${{ inputs.older-than }}
+        TENANT_DOMAIN:  ${{ inputs.tenant-domain }}
+      run: |
+        for ($ATTEMPT_NUM = 1; $ATTEMPT_NUM -le 3; $ATTEMPT_NUM++)
+        {
+          if (./onedrivePurge.ps1 -Site ${{ inputs.site }} -LibraryNameList "${{ inputs.libraries }}".split(",") -FolderPrefixPurgeList ${{ inputs.folder-prefix }} -LibraryPrefixDeleteList ${{ inputs.library-prefix && inputs.library-prefix || '[]' }} -PurgeBeforeTimestamp ${{ inputs.older-than }}) {
+            break
+          }
+        }
+

.github/actions/teams-message/action.yml

@@ -1,4 +1,5 @@
 name: Send a message to Teams
+description: Send messages to communication apps.
 
 inputs:
   msg:

.github/actions/website-linting/action.yml

@@ -1,4 +1,5 @@
 name: Lint Website
+description: Lint website content.
 
 inputs:
   version:

.github/workflows/binary-publish.yml

@@ -40,5 +40,5 @@ jobs:
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] Publishing Binary"
+          msg: "[CORSO FAILED] Publishing Binary"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}

.github/workflows/ci.yml

@@ -463,7 +463,7 @@ jobs:
           go-version-file: src/go.mod
 
       - name: Go Lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v4
         with:
           # Keep pinned to a verson as sometimes updates will add new lint
           # failures in unchanged code.

.github/workflows/ci_test_cleanup.yml

@@ -12,7 +12,7 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
-        user: [ CORSO_M365_TEST_USER_ID, CORSO_SECONDARY_M365_TEST_USER_ID, '' ]
+        user: [CORSO_M365_TEST_USER_ID, CORSO_SECONDARY_M365_TEST_USER_ID, ""]
 
     steps:
       - uses: actions/checkout@v4
@@ -33,12 +33,15 @@ jobs:
           azure-tenant-id: ${{ secrets.TENANT_ID }}
           m365-admin-user: ${{ secrets.M365_TENANT_ADMIN_USER }}
           m365-admin-password: ${{ secrets.M365_TENANT_ADMIN_PASSWORD }}
+          azure-pnp-client-id: ${{ secrets.AZURE_PNP_CLIENT_ID }}
+          azure-pnp-client-cert: ${{ secrets.AZURE_PNP_CLIENT_CERT }}
+          tenant-domain: ${{ vars.TENANT_DOMAIN }}
 
       - name: Notify failure in teams
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] ${{ vars[matrix.user] }} CI Cleanup"
+          msg: "[CORSO FAILED] ${{ vars[matrix.user] }} CI Cleanup"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}
 
   Test-Site-Data-Cleanup:
@@ -47,7 +50,7 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
-        site: [ CORSO_M365_TEST_SITE_URL, CORSO_M365_TEST_GROUPS_SITE_URL ] 
+        site: [CORSO_M365_TEST_SITE_URL, CORSO_M365_TEST_GROUPS_SITE_URL]
 
     steps:
       - uses: actions/checkout@v4
@@ -70,10 +73,13 @@ jobs:
           azure-tenant-id: ${{ secrets.TENANT_ID }}
           m365-admin-user: ${{ secrets.M365_TENANT_ADMIN_USER }}
           m365-admin-password: ${{ secrets.M365_TENANT_ADMIN_PASSWORD }}
+          azure-pnp-client-id: ${{ secrets.AZURE_PNP_CLIENT_ID }}
+          azure-pnp-client-cert: ${{ secrets.AZURE_PNP_CLIENT_CERT }}
+          tenant-domain: ${{ vars.TENANT_DOMAIN }}
 
       - name: Notify failure in teams
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] ${{ vars[matrix.site] }} CI Cleanup"
+          msg: "[CORSO FAILED] ${{ vars[matrix.site] }} CI Cleanup"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}

.github/workflows/load_test.yml

@@ -155,3 +155,6 @@ jobs:
           azure-tenant-id: ${{ secrets.TENANT_ID }}
           m365-admin-user: ${{ secrets.M365_TENANT_ADMIN_USER }}
           m365-admin-password: ${{ secrets.M365_TENANT_ADMIN_PASSWORD }}
+          azure-pnp-client-id: ${{ secrets.AZURE_PNP_CLIENT_ID }}
+          azure-pnp-client-cert: ${{ secrets.AZURE_PNP_CLIENT_CERT }}
+          tenant-domain: ${{ vars.TENANT_DOMAIN }}

.github/workflows/longevity_test.yml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
     inputs:
       user:
-        description: 'User to run longevity test on'
+        description: "User to run longevity test on"
 
 permissions:
   # required to retrieve AWS credentials
@@ -23,7 +23,7 @@ jobs:
     uses: alcionai/corso/.github/workflows/accSelector.yaml@main
 
   Longevity-Tests:
-    needs: [ SetM365App ]
+    needs: [SetM365App]
     environment: Testing
     runs-on: ubuntu-latest
     env:
@@ -37,7 +37,7 @@ jobs:
       CORSO_LOG_FILE: ${{ github.workspace }}/src/testlog/run-longevity.log
       RESTORE_DEST_PFX: Corso_Test_Longevity_
       TEST_USER: ${{ github.event.inputs.user != '' && github.event.inputs.user || vars.CORSO_M365_TEST_USER_ID }}
-      PREFIX: 'longevity'
+      PREFIX: "longevity"
 
       # Options for retention.
       RETENTION_MODE: GOVERNANCE
@@ -46,7 +46,7 @@ jobs:
     defaults:
       run:
         working-directory: src
-        
+
     ############################################################################
     # setup
     steps:
@@ -78,7 +78,7 @@ jobs:
 
       - run: go build -o corso
         timeout-minutes: 10
-      
+
       - run: mkdir ${CORSO_LOG_DIR}
 
         # Use shorter-lived credentials obtained from assume-role since these
@@ -163,7 +163,7 @@ jobs:
 
           data=$( echo $resultjson | jq -r '.[0] | .id' )
           echo result=$data >> $GITHUB_OUTPUT
- 
+
       ##########################################################################
       # Onedrive
 
@@ -328,7 +328,7 @@ jobs:
           --hide-progress \
           --force \
           --json \
-          2>&1 | tee ${{ env.CORSO_LOG_DIR }}/maintenance_metadata.txt 
+          2>&1 | tee ${{ env.CORSO_LOG_DIR }}/maintenance_metadata.txt
 
       - name: Maintenance test Weekly
         id: maintenance-test-weekly
@@ -392,5 +392,5 @@ jobs:
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] Longevity Test"
+          msg: "[CORSO FAILED] Longevity Test"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}

.github/workflows/nightly_test.yml

@@ -48,7 +48,7 @@ jobs:
   # ----------------------------------------------------------------------------------------------------
 
   Test-Suite-Trusted:
-    needs: [ Checkout, SetM365App] 
+    needs: [Checkout, SetM365App]
     environment: Testing
     runs-on: ubuntu-latest
     defaults:
@@ -100,9 +100,9 @@ jobs:
           -timeout 2h  \
           ./... 2>&1 | tee ./testlog/gotest-nightly.log | gotestfmt -hide successful-tests
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Logging & Notifications
+      # Logging & Notifications
 
       # Upload the original go test output as an artifact for later review.
       - name: Upload test log
@@ -118,5 +118,5 @@ jobs:
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] Nightly Checks"
+          msg: "[COROS FAILED] Nightly Checks"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}

.github/workflows/sanity-test.yaml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
     inputs:
       user:
-        description: 'User to run sanity test on'
+        description: "User to run sanity test on"
 
 permissions:
   # required to retrieve AWS credentials
@@ -23,7 +23,7 @@ jobs:
     uses: alcionai/corso/.github/workflows/accSelector.yaml@main
 
   Sanity-Tests:
-    needs: [ SetM365App ]
+    needs: [SetM365App]
     environment: Testing
     runs-on: ubuntu-latest
     env:
@@ -43,12 +43,11 @@ jobs:
     defaults:
       run:
         working-directory: src
-        
-##########################################################################################################################################
 
-# setup
+    ##########################################################################################################################################
+
+    # setup
     steps:
-
       - uses: actions/checkout@v4
 
       - name: Setup Golang with cache
@@ -64,9 +63,9 @@ jobs:
 
       - run: mkdir ${CORSO_LOG_DIR}
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Pre-Run cleanup
+      # Pre-Run cleanup
 
       # unlike CI tests, sanity tests are not expected to run concurrently.
       # however, the sanity yaml concurrency is set to a maximum of 1 run, preferring
@@ -91,6 +90,9 @@ jobs:
           azure-tenant-id: ${{ secrets.TENANT_ID }}
           m365-admin-user: ${{ secrets.M365_TENANT_ADMIN_USER }}
           m365-admin-password: ${{ secrets.M365_TENANT_ADMIN_PASSWORD }}
+          azure-pnp-client-id: ${{ secrets.AZURE_PNP_CLIENT_ID }}
+          azure-pnp-client-cert: ${{ secrets.AZURE_PNP_CLIENT_CERT }}
+          tenant-domain: ${{ vars.TENANT_DOMAIN }}
 
       - name: Purge CI-Produced Folders for Sites
         timeout-minutes: 30
@@ -99,17 +101,20 @@ jobs:
         with:
           site: ${{ vars.CORSO_M365_TEST_SITE_URL }}
           folder-prefix: ${{ env.RESTORE_DEST_PFX }}
-          libraries: ${{ vars.CORSO_M365_TEST_SITE_LIBRARIES }} 
+          libraries: ${{ vars.CORSO_M365_TEST_SITE_LIBRARIES }}
           older-than: ${{ env.NOW }}
           azure-client-id: ${{ secrets[needs.SetM365App.outputs.client_id_env] }}
           azure-client-secret: ${{ secrets[needs.SetM365App.outputs.client_secret_env] }}
           azure-tenant-id: ${{ secrets.TENANT_ID }}
           m365-admin-user: ${{ secrets.M365_TENANT_ADMIN_USER }}
           m365-admin-password: ${{ secrets.M365_TENANT_ADMIN_PASSWORD }}
+          azure-pnp-client-id: ${{ secrets.AZURE_PNP_CLIENT_ID }}
+          azure-pnp-client-cert: ${{ secrets.AZURE_PNP_CLIENT_CERT }}
+          tenant-domain: ${{ vars.TENANT_DOMAIN }}
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Repository commands
+      # Repository commands
 
       - name: Version Test
         timeout-minutes: 10
@@ -169,9 +174,9 @@ jobs:
             --mode complete \
             2>&1 | tee ${{ env.CORSO_LOG_DIR }}/gotest-repo-maintenance.log
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Exchange
+      # Exchange
 
       # generate new entries to roll into the next load test
       # only runs if the test was successful
@@ -193,8 +198,8 @@ jobs:
           service: exchange
           kind: first-backup
           backup-args: '--mailbox "${{ env.TEST_USER }}" --data "email"'
-          restore-args: '--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-args: "--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
@@ -206,8 +211,8 @@ jobs:
           service: exchange
           kind: incremental
           backup-args: '--mailbox "${{ env.TEST_USER }}" --data "email"'
-          restore-args: '--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-args: "--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
           backup-id: ${{ steps.exchange-backup.outputs.backup-id }}
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
@@ -220,8 +225,8 @@ jobs:
           service: exchange
           kind: non-delta
           backup-args: '--mailbox "${{ env.TEST_USER }}" --data "email" --disable-delta'
-          restore-args: '--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-args: "--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
           backup-id: ${{ steps.exchange-backup.outputs.backup-id }}
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
@@ -234,16 +239,15 @@ jobs:
           service: exchange
           kind: non-delta-incremental
           backup-args: '--mailbox "${{ env.TEST_USER }}" --data "email"'
-          restore-args: '--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-args: "--email-folder ${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.repo-init.outputs.result }}"
           backup-id: ${{ steps.exchange-backup.outputs.backup-id }}
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
+      ##########################################################################################################################################
 
-##########################################################################################################################################
+      # Onedrive
-
-# Onedrive
 
       # generate new entries for test
       - name: OneDrive - Create new data
@@ -270,8 +274,8 @@ jobs:
           service: onedrive
           kind: first-backup
           backup-args: '--user "${{ env.TEST_USER }}"'
-          restore-args: '--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}'
+          restore-args: "--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
@@ -295,14 +299,14 @@ jobs:
           service: onedrive
           kind: incremental
           backup-args: '--user "${{ env.TEST_USER }}"'
-          restore-args: '--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}'
+          restore-args: "--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-onedrive.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Sharepoint Library
+      # Sharepoint Library
 
       # generate new entries for test
       - name: SharePoint - Create new data
@@ -330,8 +334,8 @@ jobs:
           service: sharepoint
           kind: first-backup
           backup-args: '--site "${{ vars.CORSO_M365_TEST_SITE_URL }}" --data libraries'
-          restore-args: '--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}'
+          restore-args: "--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
           category: libraries
@@ -357,15 +361,15 @@ jobs:
           service: sharepoint
           kind: incremental
           backup-args: '--site "${{ vars.CORSO_M365_TEST_SITE_URL }}" --data libraries'
-          restore-args: '--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}'
+          restore-args: "--folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}"
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-sharepoint.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
           category: libraries
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Sharepoint Lists
+      # Sharepoint Lists
 
       # generate new entries for test
       # The `awk | tr | sed` command chain is used to get a comma separated list of SharePoint list names.
@@ -418,7 +422,7 @@ jobs:
         working-directory: ./src/cmd/factory
         run: |
           suffix=$(date +"%Y-%m-%d_%H-%M-%S")
-          
+
           go run . sharepoint lists  \
             --site ${{ vars.CORSO_M365_TEST_SITE_URL }} \
             --user ${{ env.TEST_USER }} \
@@ -454,9 +458,9 @@ jobs:
           category: lists
           on-collision: copy
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Groups and Teams
+      # Groups and Teams
 
       # generate new entries for test
       - name: Groups - Create new data
@@ -483,8 +487,8 @@ jobs:
         with:
           service: groups
           kind: first-backup
-          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}"'
+          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}" --data messages,libraries'
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
@@ -508,15 +512,15 @@ jobs:
         with:
           service: groups
           kind: incremental
-          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}"'
+          backup-args: '--group "${{ vars.CORSO_M365_TEST_TEAM_ID }}" --data messages,libraries'
           restore-args: '--site "${{ vars.CORSO_M365_TEST_GROUPS_SITE_URL }}" --folder ${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}'
-          restore-container: '${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}'
+          restore-container: "${{ env.RESTORE_DEST_PFX }}${{ steps.new-data-creation-groups.outputs.result }}"
           log-dir: ${{ env.CORSO_LOG_DIR }}
           with-export: true
 
-##########################################################################################################################################
+      ##########################################################################################################################################
 
-# Logging & Notifications
+      # Logging & Notifications
 
       # Upload the original go test output as an artifact for later review.
       - name: Upload test log
@@ -532,5 +536,5 @@ jobs:
         if: failure()
         uses: ./.github/actions/teams-message
         with:
-          msg: "[FAILED] Sanity Tests"
+          msg: "[CORSO FAILED] Sanity Tests"
           teams_url: ${{ secrets.TEAMS_CORSO_CI_WEBHOOK_URL }}

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Emails attached within other emails are now correctly exported
 - Gracefully handle email and post attachments without name when exporting to eml
 - Use correct timezone for event start and end times in Exchange exports (helps fix issues in relative recurrence patterns)
+- Fixed an issue causing exports dealing with calendar data to have high memory usage
 
 ## [v0.19.0] (beta) - 2024-02-06
 

README.md

@@ -1,3 +1,6 @@
+> [!NOTE] 
+> **The Corso project is no longer actively maintained and has been archived**.
+
 <p align="center">
     <img src="https://github.com/alcionai/corso/blob/main/website/static/img/corso_logo.svg?raw=true" alt="Corso Logo" width="100" />
 </p>

src/cli/backup/exchange_e2e_test.go

@@ -150,8 +150,11 @@ func runExchangeBackupCategoryTest(suite *BackupExchangeE2ESuite, category path.
 	result := recorder.String()
 	t.Log("backup results", result)
 
-	// as an offhand check: the result should contain the m365 user id
+	// As an offhand check: the result should contain the m365 user's email.
-	assert.Contains(t, result, suite.m365.User.ID)
+	assert.Contains(
+		t,
+		strings.ToLower(result),
+		strings.ToLower(suite.m365.User.Provider.Name()))
 }
 
 func (suite *BackupExchangeE2ESuite) TestExchangeBackupCmd_ServiceNotEnabled_email() {
@@ -183,8 +186,11 @@ func runExchangeBackupServiceNotEnabledTest(suite *BackupExchangeE2ESuite, categ
 	result := recorder.String()
 	t.Log("backup results", result)
 
-	// as an offhand check: the result should contain the m365 user id
+	// As an offhand check: the result should contain the m365 user's email.
-	assert.Contains(t, result, suite.m365.User.ID)
+	assert.Contains(
+		t,
+		strings.ToLower(result),
+		strings.ToLower(suite.m365.User.Provider.Name()))
 }
 
 func (suite *BackupExchangeE2ESuite) TestExchangeBackupCmd_userNotFound_email() {
@@ -282,8 +288,11 @@ func (suite *BackupExchangeE2ESuite) TestBackupCreateExchange_fromConfigFile() {
 	result := suite.dpnd.recorder.String()
 	t.Log("backup results", result)
 
-	// as an offhand check: the result should contain the m365 user id
+	// As an offhand check: the result should contain the m365 user's email.
-	assert.Contains(t, result, suite.m365.User.ID)
+	assert.Contains(
+		t,
+		strings.ToLower(result),
+		strings.ToLower(suite.m365.User.Provider.Name()))
 }
 
 // AWS flags

src/cli/backup/groups_e2e_test.go

@@ -114,6 +114,8 @@ func (suite *BackupGroupsE2ESuite) TestGroupsBackupCmd_channelMessages() {
 }
 
 func (suite *BackupGroupsE2ESuite) TestGroupsBackupCmd_conversations() {
+	// skip
+	suite.T().Skip("CorsoCITeam group mailbox backup is broken")
 	runGroupsBackupCategoryTest(suite, flags.DataConversations)
 }
 
@@ -217,6 +219,9 @@ func (suite *BackupGroupsE2ESuite) TestBackupCreateGroups_badAzureClientIDFlag()
 }
 
 func (suite *BackupGroupsE2ESuite) TestBackupCreateGroups_fromConfigFile() {
+	// Skip
+	suite.T().Skip("CorsoCITeam group mailbox backup is broken")
+
 	t := suite.T()
 	ctx, flush := tester.NewContext(t)
 	ctx = config.SetViper(ctx, suite.dpnd.vpr)
@@ -300,7 +305,10 @@ func (suite *PreparedBackupGroupsE2ESuite) SetupSuite() {
 		ins    = idname.NewCache(map[string]string{suite.m365.Group.ID: suite.m365.Group.ID})
 		cats   = []path.CategoryType{
 			path.ChannelMessagesCategory,
-			path.ConversationPostsCategory,
+			// TODO(pandeyabs): CorsoCITeam group mailbox backup is currently broken because of invalid
+			// odata.NextLink which causes an infinite loop during paging. Disabling conversations tests while
+			// we go fix the group mailbox.
+			// path.ConversationPostsCategory,
 			path.LibrariesCategory,
 		}
 	)
@@ -454,6 +462,8 @@ func (suite *PreparedBackupGroupsE2ESuite) TestGroupsDetailsCmd_channelMessages(
 }
 
 func (suite *PreparedBackupGroupsE2ESuite) TestGroupsDetailsCmd_conversations() {
+	// skip
+	suite.T().Skip("CorsoCITeam group mailbox backup is broken")
 	runGroupsDetailsCmdTest(suite, path.ConversationPostsCategory)
 }
 

src/cmd/purge/scripts/onedrivePurge.ps1

@@ -6,12 +6,6 @@ Param (
     [Parameter(Mandatory = $False, HelpMessage = "Site for which to delete folders in SharePoint")]
     [String]$Site,
 
-    [Parameter(Mandatory = $False, HelpMessage = "Exchange Admin email")]
-    [String]$AdminUser = $ENV:M365_TENANT_ADMIN_USER,
-
-    [Parameter(Mandatory = $False, HelpMessage = "Exchange Admin password")]
-    [String]$AdminPwd = $ENV:M365_TENANT_ADMIN_PASSWORD,
-
     [Parameter(Mandatory = $False, HelpMessage = "Document library root. Can add multiple comma-separated values")]
     [String[]]$LibraryNameList = @(),
 
@@ -22,7 +16,16 @@ Param (
     [String[]]$FolderPrefixPurgeList,
 
     [Parameter(Mandatory = $False, HelpMessage = "Delete document libraries with this prefix")]
-    [String[]]$LibraryPrefixDeleteList = @()
+    [String[]]$LibraryPrefixDeleteList = @(),
+
+    [Parameter(Mandatory = $False, HelpMessage = "Tenant domain")]
+    [String]$TenantDomain = $ENV:TENANT_DOMAIN,
+
+    [Parameter(Mandatory = $False, HelpMessage = "Azure ClientId")]
+    [String]$ClientId = $ENV:AZURE_CLIENT_ID,
+
+    [Parameter(Mandatory = $False, HelpMessage = "Azure AppCert")]
+    [String]$AppCert = $ENV:AZURE_APP_CERT
 )
 
 Set-StrictMode -Version 2.0
@@ -37,7 +40,7 @@ function Get-TimestampFromFolderName {
 
     $name = $folder.Name
 
-    #fallback on folder create time 
+    #fallback on folder create time
     [datetime]$timestamp = $folder.TimeCreated
 
     try {
@@ -66,7 +69,7 @@ function Get-TimestampFromListName {
 
     $name = $list.Title
 
-    #fallback on list create time 
+    #fallback on list create time
     [datetime]$timestamp = $list.LastItemUserModifiedDate
 
     try {
@@ -106,8 +109,9 @@ function Purge-Library {
     Write-Host "`nPurging library: $LibraryName"
 
     $foldersToPurge = @()
-    $folders = Get-PnPFolderItem -FolderSiteRelativeUrl $LibraryName -ItemType Folder 
+    $folders = Get-PnPFolderItem -FolderSiteRelativeUrl $LibraryName -ItemType Folder
 
+    Write-Host "`nFolders: $folders"
     foreach ($f in $folders) {
         $folderName = $f.Name
         $createTime = Get-TimestampFromFolderName -Folder $f
@@ -159,7 +163,7 @@ function Delete-LibraryByPrefix {
     Write-Host "`nDeleting library: $LibraryNamePrefix"
 
     $listsToDelete = @()
-    $lists = Get-PnPList 
+    $lists = Get-PnPList
 
     foreach ($l in $lists) {
         $listName = $l.Title
@@ -183,7 +187,7 @@ function Delete-LibraryByPrefix {
             Write-Host "Deleting list: "$l.Title
             try {
                 $listInfo = Get-PnPList -Identity $l.Id | Select-Object -Property Hidden
-                
+
                 # Check if the 'hidden' property is true
                 if ($listInfo.Hidden) {
                     Write-Host "List: $($l.Title) is hidden. Skipping..."
@@ -209,8 +213,8 @@ if (-not (Get-Module -ListAvailable -Name PnP.PowerShell)) {
 }
 
 
-if ([string]::IsNullOrEmpty($AdminUser) -or [string]::IsNullOrEmpty($AdminPwd)) {
+if ([string]::IsNullOrEmpty($ClientId) -or [string]::IsNullOrEmpty($AppCert)) {
-    Write-Host "Admin user name and password required as arguments or environment variables."
+    Write-Host "ClientId and AppCert required as arguments or environment variables."
     Exit
 }
 
@@ -251,12 +255,8 @@ else {
     Exit
 }
 
-
-$password = convertto-securestring -String $AdminPwd -AsPlainText -Force
-$cred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $AdminUser, $password
-
 Write-Host "`nAuthenticating and connecting to $SiteUrl"
-Connect-PnPOnline -Url $siteUrl -Credential $cred
+Connect-PnPOnline -Url $siteUrl -ClientId $ClientId -CertificateBase64Encoded $AppCert -Tenant $TenantDomain
 Write-Host "Connected to $siteUrl`n"
 
 # ensure that there are no unexpanded entries in the list of parameters

src/cmd/sanity_test/driveish/driveish.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/alcionai/clues"
 	"github.com/microsoftgraph/msgraph-sdk-go/models"
+	"golang.org/x/exp/slices"
 
 	"github.com/alcionai/corso/src/cmd/sanity_test/common"
 	"github.com/alcionai/corso/src/internal/common/ptr"
@@ -20,19 +21,20 @@ const (
 // this increases the chance that we'll run into a race collision with
 // the cleanup script.  Sometimes that's okay (deleting old data that
 // isn't scrutinized in the test), other times it's not.  We mark whether
-// that's okay to do or not by specifying the folder that's being
+// that's okay to do or not by specifying the folders being
-// scrutinized for the test.  Any errors within that folder should cause
+// scrutinized for the test.  Any errors within those folders should cause
-// a fatal exit.  Errors outside of that folder get ignored.
+// a fatal exit.  Errors outside of those folders get ignored.
 //
-// since we're using folder names, requireNoErrorsWithinFolderName will
+// since we're using folder names, mustPopulateFolders will
 // work best (ie: have the fewest collisions/side-effects) if the folder
-// name is very specific.  Standard sanity tests should include timestamps,
+// names are very specific.  Standard sanity tests should include timestamps,
 // which should help ensure that.  Be warned if you try to use it with
 // a more generic name: unintended effects could occur.
 func populateSanitree(
 	ctx context.Context,
 	ac api.Client,
-	driveID, requireNoErrorsWithinFolderName string,
+	driveID string,
+	mustPopulateFolders []string,
 ) *common.Sanitree[models.DriveItemable, models.DriveItemable] {
 	common.Infof(ctx, "building sanitree for drive: %s", driveID)
 
@@ -56,8 +58,8 @@ func populateSanitree(
 		ac,
 		driveID,
 		stree.Name+"/",
-		requireNoErrorsWithinFolderName,
+		mustPopulateFolders,
-		rootName == requireNoErrorsWithinFolderName,
+		slices.Contains(mustPopulateFolders, rootName),
 		stree)
 
 	return stree
@@ -66,7 +68,9 @@ func populateSanitree(
 func recursivelyBuildTree(
 	ctx context.Context,
 	ac api.Client,
-	driveID, location, requireNoErrorsWithinFolderName string,
+	driveID string,
+	location string,
+	mustPopulateFolders []string,
 	isChildOfFolderRequiringNoErrors bool,
 	stree *common.Sanitree[models.DriveItemable, models.DriveItemable],
 ) {
@@ -80,9 +84,9 @@ func recursivelyBuildTree(
 
 		common.Infof(
 			ctx,
-			"ignoring error getting children in directory %q because it is not within directory %q\nerror: %s\n%+v",
+			"ignoring error getting children in directory %q because it is not within directory set %v\nerror: %s\n%+v",
 			location,
-			requireNoErrorsWithinFolderName,
+			mustPopulateFolders,
 			err.Error(),
 			clues.ToCore(err))
 
@@ -99,11 +103,12 @@ func recursivelyBuildTree(
 			// currently we don't restore blank folders.
 			// skip permission check for empty folders
 			if ptr.Val(driveItem.GetFolder().GetChildCount()) == 0 {
-				common.Infof(ctx, "skipped empty folder: %s/%s", location, itemName)
+				common.Infof(ctx, "skipped empty folder: %s%s", location, itemName)
 				continue
 			}
 
-			cannotAllowErrors := isChildOfFolderRequiringNoErrors || itemName == requireNoErrorsWithinFolderName
+			cannotAllowErrors := isChildOfFolderRequiringNoErrors ||
+				slices.Contains(mustPopulateFolders, itemName)
 
 			branch := &common.Sanitree[models.DriveItemable, models.DriveItemable]{
 				Parent: stree,
@@ -124,7 +129,7 @@ func recursivelyBuildTree(
 				ac,
 				driveID,
 				location+branch.Name+"/",
-				requireNoErrorsWithinFolderName,
+				mustPopulateFolders,
 				cannotAllowErrors,
 				branch)
 		}

src/cmd/sanity_test/driveish/export.go

@@ -32,7 +32,7 @@ func CheckExport(
 		ctx,
 		ac,
 		driveID,
-		envs.RestoreContainer)
+		[]string{envs.SourceContainer})
 
 	sourceTree, ok := root.Children[envs.SourceContainer]
 	common.Assert(

src/cmd/sanity_test/driveish/restore.go

@@ -45,7 +45,14 @@ func CheckRestoration(
 		"drive_id", driveID,
 		"drive_name", driveName)
 
-	root := populateSanitree(ctx, ac, driveID, envs.RestoreContainer)
+	root := populateSanitree(
+		ctx,
+		ac,
+		driveID,
+		[]string{
+			envs.SourceContainer,
+			envs.RestoreContainer,
+		})
 
 	sourceTree, ok := root.Children[envs.SourceContainer]
 	common.Assert(

src/go.mod

@@ -3,7 +3,7 @@ module github.com/alcionai/corso/src
 go 1.21
 
 replace (
-	github.com/kopia/kopia => github.com/alcionai/kopia v0.12.2-0.20240116215733-ec3d100029fe
+	github.com/kopia/kopia => github.com/alcionai/kopia v0.12.2-0.20240322180947-41471159a0a4
 
 	// Alcion fork removes the validation of email addresses as we might get incomplete email addresses
 	github.com/xhit/go-simple-mail/v2 v2.16.0 => github.com/alcionai/go-simple-mail/v2 v2.0.0-20231220071811-c70ebcd9a41a
@@ -121,7 +121,7 @@ require (
 	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
 	github.com/microsoft/kiota-serialization-text-go v1.0.0
 	github.com/minio/md5-simd v1.1.2 // indirect
-	github.com/minio/minio-go/v7 v7.0.66
+	github.com/minio/minio-go/v7 v7.0.67
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect

src/go.sum

@@ -23,8 +23,8 @@ github.com/alcionai/clues v0.0.0-20240125221452-9fc7746dd20c h1:QtARFaqYKtGjmEej
 github.com/alcionai/clues v0.0.0-20240125221452-9fc7746dd20c/go.mod h1:1YJwJy3W6GGsC2UiDAEWABUjgvT8OZHjKs8OoaXeKbw=
 github.com/alcionai/go-simple-mail/v2 v2.0.0-20231220071811-c70ebcd9a41a h1:4nhM0NM1qtUT1s55rQ+D0Xw1Re5mIU9/crjEl6KdE+k=
 github.com/alcionai/go-simple-mail/v2 v2.0.0-20231220071811-c70ebcd9a41a/go.mod h1:b7P5ygho6SYE+VIqpxA6QkYfv4teeyG4MKqB3utRu98=
-github.com/alcionai/kopia v0.12.2-0.20240116215733-ec3d100029fe h1:nLS5pxhm04Jz4+qeipNlxdyPGxqNWpBu8UGkRYpWoIw=
+github.com/alcionai/kopia v0.12.2-0.20240322180947-41471159a0a4 h1:3YZ70H3mkUgwiHLiNvukrqh2awRgfl1RAkbV0IoUqqk=
-github.com/alcionai/kopia v0.12.2-0.20240116215733-ec3d100029fe/go.mod h1:QFRSOUQzZfKE3hKVBHP7hxOn5WyrEmdBtfN5wkib/eA=
+github.com/alcionai/kopia v0.12.2-0.20240322180947-41471159a0a4/go.mod h1:QFRSOUQzZfKE3hKVBHP7hxOn5WyrEmdBtfN5wkib/eA=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -219,8 +219,8 @@ github.com/microsoftgraph/msgraph-sdk-go-core v1.0.1 h1:uq4qZD8VXLiNZY0t4NoRpLDo
 github.com/microsoftgraph/msgraph-sdk-go-core v1.0.1/go.mod h1:HUITyuFN556+0QZ/IVfH5K4FyJM7kllV6ExKi2ImKhE=
 github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
 github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
-github.com/minio/minio-go/v7 v7.0.66 h1:bnTOXOHjOqv/gcMuiVbN9o2ngRItvqE774dG9nq0Dzw=
+github.com/minio/minio-go/v7 v7.0.67 h1:BeBvZWAS+kRJm1vGTMJYVjKUNoo0FoEt/wUWdUtfmh8=
-github.com/minio/minio-go/v7 v7.0.66/go.mod h1:DHAgmyQEGdW3Cif0UooKOyrT3Vxs82zNdV6tkKhRtbs=
+github.com/minio/minio-go/v7 v7.0.67/go.mod h1:+UXocnUeZ3wHvVh5s95gcrA4YjMIbccT6ubB+1m054A=
 github.com/minio/sha256-simd v1.0.1 h1:6kaan5IFmwTNynnKKpDHe6FWHohJOHhCPchzK49dzMM=
 github.com/minio/sha256-simd v1.0.1/go.mod h1:Pz6AKMiUdngCLpeTL/RJY1M9rUuPMYujV5xJjtbRSN8=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=

src/internal/archive/zip.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/alcionai/corso/src/pkg/dttm"
 	"github.com/alcionai/corso/src/pkg/export"
+	"github.com/alcionai/corso/src/pkg/logger"
 )
 
 const (
@@ -56,12 +57,22 @@ func ZipExportCollection(
 		defer wr.Close()
 
 		buf := make([]byte, ZipCopyBufferSize)
+		counted := 0
+		log := logger.Ctx(ctx).
+			With("collection_count", len(expCollections))
 
 		for _, ec := range expCollections {
 			folder := ec.BasePath()
 			items := ec.Items(ctx)
 
 			for item := range items {
+				counted++
+
+				// Log every 1000 items that are processed
+				if counted%1000 == 0 {
+					log.Infow("progress zipping export items", "count_items", counted)
+				}
+
 				err := item.Error
 				if err != nil {
 					writer.CloseWithError(clues.Wrap(err, "getting export item").With("id", item.ID))
@@ -88,8 +99,12 @@ func ZipExportCollection(
 					writer.CloseWithError(clues.Wrap(err, "writing zip entry").With("name", name).With("id", item.ID))
 					return
 				}
+
+				item.Body.Close()
 			}
 		}
+
+		log.Infow("completed zipping export items", "count_items", counted)
 	}()
 
 	return zipCollection{reader}, nil

src/internal/common/jwt/jwt.go

@@ -1,10 +1,13 @@
 package jwt
 
 import (
+	"context"
 	"time"
 
 	"github.com/alcionai/clues"
 	jwt "github.com/golang-jwt/jwt/v5"
+
+	"github.com/alcionai/corso/src/pkg/logger"
 )
 
 // IsJWTExpired checks if the JWT token is past expiry by analyzing the
@@ -37,3 +40,51 @@ func IsJWTExpired(
 
 	return expired, nil
 }
+
+// GetJWTLifetime returns the issued at(iat) and expiration time(exp) claims
+// present in the JWT token. These are optional claims and may not be present
+// in the token. Absence is not reported as an error.
+//
+// An error is returned if the supplied token is malformed. Times are returned
+// in UTC to have parity with graph responses.
+func GetJWTLifetime(
+	ctx context.Context,
+	rawToken string,
+) (time.Time, time.Time, error) {
+	var (
+		issuedAt  time.Time
+		expiresAt time.Time
+	)
+
+	p := jwt.NewParser()
+
+	token, _, err := p.ParseUnverified(rawToken, &jwt.RegisteredClaims{})
+	if err != nil {
+		logger.CtxErr(ctx, err).Debug("parsing jwt token")
+		return time.Time{}, time.Time{}, clues.Wrap(err, "invalid jwt")
+	}
+
+	exp, err := token.Claims.GetExpirationTime()
+	if err != nil {
+		logger.CtxErr(ctx, err).Debug("extracting exp claim")
+		return time.Time{}, time.Time{}, clues.Wrap(err, "getting token expiry time")
+	}
+
+	iat, err := token.Claims.GetIssuedAt()
+	if err != nil {
+		logger.CtxErr(ctx, err).Debug("extracting iat claim")
+		return time.Time{}, time.Time{}, clues.Wrap(err, "getting token issued at time")
+	}
+
+	// Absence of iat or exp claims is not reported as an error by jwt library as these
+	// are optional as per spec.
+	if iat != nil {
+		issuedAt = iat.UTC()
+	}
+
+	if exp != nil {
+		expiresAt = exp.UTC()
+	}
+
+	return issuedAt, expiresAt, nil
+}

src/internal/common/jwt/jwt_test.go

@@ -113,3 +113,134 @@ func (suite *JWTUnitSuite) TestIsJWTExpired() {
 		})
 	}
 }
+
+func (suite *JWTUnitSuite) TestGetJWTLifetime() {
+	// Set of time values to be used in the tests.
+	// Truncate to seconds for comparisons since jwt tokens have second
+	// level precision.
+	idToTime := map[string]time.Time{
+		"T0": time.Now().UTC().Add(-time.Hour).Truncate(time.Second),
+		"T1": time.Now().UTC().Truncate(time.Second),
+		"T2": time.Now().UTC().Add(time.Hour).Truncate(time.Second),
+	}
+
+	table := []struct {
+		name       string
+		getToken   func() (string, error)
+		expectFunc func(t *testing.T, iat time.Time, exp time.Time)
+		expectErr  assert.ErrorAssertionFunc
+	}{
+		{
+			name: "alive token",
+			getToken: func() (string, error) {
+				return createJWTToken(
+					jwt.RegisteredClaims{
+						IssuedAt:  jwt.NewNumericDate(idToTime["T0"]),
+						ExpiresAt: jwt.NewNumericDate(idToTime["T1"]),
+					})
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, idToTime["T0"], iat)
+				assert.Equal(t, idToTime["T1"], exp)
+			},
+			expectErr: assert.NoError,
+		},
+		// Test with a token which is not generated using the go-jwt lib.
+		// This is a long lived token which is valid for 100 years.
+		{
+			name: "alive raw token with iat and exp claims",
+			getToken: func() (string, error) {
+				return rawToken, nil
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Less(t, iat, time.Now(), "iat should be in the past")
+				assert.Greater(t, exp, time.Now(), "exp should be in the future")
+			},
+			expectErr: assert.NoError,
+		},
+		// Regardless of whether the token is expired or not, we should be able to
+		// extract the iat and exp claims from it without error.
+		{
+			name: "expired token",
+			getToken: func() (string, error) {
+				return createJWTToken(
+					jwt.RegisteredClaims{
+						IssuedAt:  jwt.NewNumericDate(idToTime["T1"]),
+						ExpiresAt: jwt.NewNumericDate(idToTime["T0"]),
+					})
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, idToTime["T1"], iat)
+				assert.Equal(t, idToTime["T0"], exp)
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "missing iat claim",
+			getToken: func() (string, error) {
+				return createJWTToken(
+					jwt.RegisteredClaims{
+						ExpiresAt: jwt.NewNumericDate(idToTime["T2"]),
+					})
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, time.Time{}, iat)
+				assert.Equal(t, idToTime["T2"], exp)
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "missing exp claim",
+			getToken: func() (string, error) {
+				return createJWTToken(
+					jwt.RegisteredClaims{
+						IssuedAt: jwt.NewNumericDate(idToTime["T0"]),
+					})
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, idToTime["T0"], iat)
+				assert.Equal(t, time.Time{}, exp)
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "both claims missing",
+			getToken: func() (string, error) {
+				return createJWTToken(jwt.RegisteredClaims{})
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, time.Time{}, iat)
+				assert.Equal(t, time.Time{}, exp)
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "malformed token",
+			getToken: func() (string, error) {
+				return "header.claims.signature", nil
+			},
+			expectFunc: func(t *testing.T, iat time.Time, exp time.Time) {
+				assert.Equal(t, time.Time{}, iat)
+				assert.Equal(t, time.Time{}, exp)
+			},
+			expectErr: assert.Error,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			token, err := test.getToken()
+			require.NoError(t, err)
+
+			iat, exp, err := GetJWTLifetime(ctx, token)
+			test.expectErr(t, err)
+
+			test.expectFunc(t, iat, exp)
+		})
+	}
+}

src/internal/common/str/str.go

@@ -59,6 +59,19 @@ func First(vs ...string) string {
 	return ""
 }
 
+// FirstIn returns the first entry in the map with a non-zero value
+// when iterating the provided list of keys.
+func FirstIn(m map[string]any, keys ...string) string {
+	for _, key := range keys {
+		v, err := AnyValueToString(key, m)
+		if err == nil && len(v) > 0 {
+			return v
+		}
+	}
+
+	return ""
+}
+
 // Preview reduces the string to the specified size.
 // If the string is longer than the size, the last three
 // characters are replaced with an ellipsis.  Size < 4

src/internal/common/str/str_test.go

@@ -118,3 +118,96 @@ func TestGenerateHash(t *testing.T) {
 		}
 	}
 }
+
+func TestFirstIn(t *testing.T) {
+	table := []struct {
+		name   string
+		m      map[string]any
+		keys   []string
+		expect string
+	}{
+		{
+			name:   "nil map",
+			keys:   []string{"foo", "bar"},
+			expect: "",
+		},
+		{
+			name:   "empty map",
+			m:      map[string]any{},
+			keys:   []string{"foo", "bar"},
+			expect: "",
+		},
+		{
+			name: "no match",
+			m: map[string]any{
+				"baz": "baz",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "",
+		},
+		{
+			name: "no keys",
+			m: map[string]any{
+				"baz": "baz",
+			},
+			keys:   []string{},
+			expect: "",
+		},
+		{
+			name: "nil match",
+			m: map[string]any{
+				"foo": nil,
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "",
+		},
+		{
+			name: "empty match",
+			m: map[string]any{
+				"foo": "",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "",
+		},
+		{
+			name: "matches first key",
+			m: map[string]any{
+				"foo": "fnords",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "fnords",
+		},
+		{
+			name: "matches second key",
+			m: map[string]any{
+				"bar": "smarf",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "smarf",
+		},
+		{
+			name: "matches second key with nil first match",
+			m: map[string]any{
+				"foo": nil,
+				"bar": "smarf",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "smarf",
+		},
+		{
+			name: "matches second key with empty first match",
+			m: map[string]any{
+				"foo": "",
+				"bar": "smarf",
+			},
+			keys:   []string{"foo", "bar"},
+			expect: "smarf",
+		},
+	}
+	for _, test := range table {
+		t.Run(test.name, func(t *testing.T) {
+			result := FirstIn(test.m, test.keys...)
+			assert.Equal(t, test.expect, result)
+		})
+	}
+}

src/internal/converters/eml/eml.go

@@ -208,6 +208,15 @@ func getItemAttachment(ctx context.Context, attachment models.Attachmentable) (*
 			With("attachment_id", ptr.Val(attachment.GetId()))
 	}
 
+	name := ptr.Val(attachment.GetName())
+	if len(name) == 0 {
+		// Graph as of now does not let us create any attachments
+		// without a name, but we have run into instances where we have
+		// see attachments without a name, possibly from old
+		// data. This is for those cases.
+		name = "Unnamed"
+	}
+
 	switch it := it.(type) {
 	case *models.Message:
 		cb, err := FromMessageable(ctx, it)
@@ -217,7 +226,7 @@ func getItemAttachment(ctx context.Context, attachment models.Attachmentable) (*
 		}
 
 		return &mail.File{
-			Name:     ptr.Val(attachment.GetName()),
+			Name:     name,
 			MimeType: "message/rfc822",
 			Data:     []byte(cb),
 		}, nil

src/internal/converters/eml/eml_test.go

@@ -137,6 +137,11 @@ func (suite *EMLUnitSuite) TestConvert_messageble_to_eml() {
 }
 
 func (suite *EMLUnitSuite) TestConvert_edge_cases() {
+	bodies := []string{
+		testdata.EmailWithAttachments,
+		testdata.EmailWithinEmail,
+	}
+
 	tests := []struct {
 		name      string
 		transform func(models.Messageable)
@@ -202,33 +207,35 @@ func (suite *EMLUnitSuite) TestConvert_edge_cases() {
 		},
 	}
 
-	for _, test := range tests {
+	for _, b := range bodies {
-		suite.Run(test.name, func() {
+		for _, test := range tests {
-			t := suite.T()
+			suite.Run(test.name, func() {
+				t := suite.T()
 
-			ctx, flush := tester.NewContext(t)
+				ctx, flush := tester.NewContext(t)
-			defer flush()
+				defer flush()
 
-			body := []byte(testdata.EmailWithAttachments)
+				body := []byte(b)
 
-			msg, err := api.BytesToMessageable(body)
+				msg, err := api.BytesToMessageable(body)
-			require.NoError(t, err, "creating message")
+				require.NoError(t, err, "creating message")
 
-			test.transform(msg)
+				test.transform(msg)
 
-			writer := kjson.NewJsonSerializationWriter()
+				writer := kjson.NewJsonSerializationWriter()
 
-			defer writer.Close()
+				defer writer.Close()
 
-			err = writer.WriteObjectValue("", msg)
+				err = writer.WriteObjectValue("", msg)
-			require.NoError(t, err, "serializing message")
+				require.NoError(t, err, "serializing message")
 
-			nbody, err := writer.GetSerializedContent()
+				nbody, err := writer.GetSerializedContent()
-			require.NoError(t, err, "getting serialized content")
+				require.NoError(t, err, "getting serialized content")
 
-			_, err = FromJSON(ctx, nbody)
+				_, err = FromJSON(ctx, nbody)
-			assert.NoError(t, err, "converting to eml")
+				assert.NoError(t, err, "converting to eml")
-		})
+			})
+		}
 	}
 }
 
@@ -461,7 +468,7 @@ func (suite *EMLUnitSuite) TestConvert_message_in_messageble_to_eml() {
 	assert.Equal(t, formatAddress(msg.GetFrom().GetEmailAddress()), eml.GetHeader("From"))
 
 	attachments := eml.Attachments
-	assert.Equal(t, 1, len(attachments), "attachment count in parent email")
+	assert.Equal(t, 3, len(attachments), "attachment count in parent email")
 
 	ieml, err := enmime.ReadEnvelope(strings.NewReader(string(attachments[0].Content)))
 	require.NoError(t, err, "reading created eml")

src/internal/converters/eml/testdata/email-within-email.json

@@ -77,6 +77,146 @@
         ],
         "webLink": "https://outlook.office365.com/owa/?AttachmentItemID=AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV%2FqAAABEgAQAEUyH0VS3HJBgHDlZdWZl0k%3D&exvsurl=1&viewmodel=ItemAttachment"
       }
+    },
+    {
+      "id": "AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV-qAAABEgAQAEUyH0VS3HJBgHDlZdWZl02=",
+      "@odata.type": "#microsoft.graph.itemAttachment",
+      "item@odata.navigationLink": "https://graph.microsoft.com/v1.0/users('7ceb8e03-bdc5-4509-a136-457526165ec0')/messages('')",
+      "item@odata.associationLink": "https://graph.microsoft.com/v1.0/users('7ceb8e03-bdc5-4509-a136-457526165ec0')/messages('')/$ref",
+      "isInline": false,
+      "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+      "name": "Purpose of life part 2",
+      "size": 11840,
+      "item": {
+        "id": "",
+        "@odata.type": "#microsoft.graph.message",
+        "createdDateTime": "2024-02-05T09:33:24Z",
+        "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+        "attachments": [
+          {
+            "id": "AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV-qAAACEgAQAEUyH0VS3HJBgHDlZdWZl0kSABAAjBhd4-oQaUS969pTkS-gzA==",
+            "@odata.type": "#microsoft.graph.fileAttachment",
+            "@odata.mediaContentType": "text/calendar",
+            "contentType": "text/calendar",
+            "isInline": false,
+            "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+            "name": "Abidjan.ics",
+            "size": 573,
+            "contentBytes": "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"
+          }
+        ],
+        "body": {
+          "content": "<html><head>\r\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><style type=\"text/css\" style=\"display:none;\"> P {margin-top:0;margin-bottom:0;} </style></head><body dir=\"ltr\"><div class=\"elementToProof\" style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);\">I just realized the purpose of my life is to be a test case. Good to know.<br></div></body></html>",
+          "contentType": "html"
+        },
+        "bodyPreview": "I just realized the purpose of my life is to be a test case. Good to know.",
+        "conversationId": "AAQkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNAAQAFEnxDqYmbJEm8d2l3qfS6A=",
+        "conversationIndex": "AQHaWBYiUSfEOpiZskSbx3aXep9LoA==",
+        "flag": {
+          "flagStatus": "notFlagged"
+        },
+        "from": {
+          "emailAddress": {
+            "address": "JohannaL@10rqc2.onmicrosoft.com",
+            "name": "Johanna Lorenz"
+          }
+        },
+        "hasAttachments": true,
+        "importance": "normal",
+        "internetMessageId": "<SJ0PR04MB7294108E381BCCE5C207B6DEBC472@SJ0PR04MB7294.namprd04.prod.outlook.com>",
+        "isDeliveryReceiptRequested": false,
+        "isDraft": false,
+        "isRead": true,
+        "isReadReceiptRequested": false,
+        "receivedDateTime": "2024-02-05T09:33:12Z",
+        "sender": {
+          "emailAddress": {
+            "address": "JohannaL@10rqc2.onmicrosoft.com",
+            "name": "Johanna Lorenz"
+          }
+        },
+        "sentDateTime": "2024-02-05T09:33:11Z",
+        "subject": "Purpose of life",
+        "toRecipients": [
+          {
+            "emailAddress": {
+              "address": "PradeepG@10rqc2.onmicrosoft.com",
+              "name": "Pradeep Gupta"
+            }
+          }
+        ],
+        "webLink": "https://outlook.office365.com/owa/?AttachmentItemID=AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV%2FqAAABEgAQAEUyH0VS3HJBgHDlZdWZl02%3D&exvsurl=1&viewmodel=ItemAttachment"
+      }
+    },
+    {
+      "id": "AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV-qAAABEgAQAEUyH0VS3HJBgHDlZdWZl03=",
+      "@odata.type": "#microsoft.graph.itemAttachment",
+      "item@odata.navigationLink": "https://graph.microsoft.com/v1.0/users('7ceb8e03-bdc5-4509-a136-457526165ec0')/messages('')",
+      "item@odata.associationLink": "https://graph.microsoft.com/v1.0/users('7ceb8e03-bdc5-4509-a136-457526165ec0')/messages('')/$ref",
+      "isInline": false,
+      "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+      "name": "Purpose of life part 3",
+      "size": 11840,
+      "item": {
+        "id": "",
+        "@odata.type": "#microsoft.graph.message",
+        "createdDateTime": "2024-02-05T09:33:24Z",
+        "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+        "attachments": [
+          {
+            "id": "AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV-qAAACEgAQAEUyH0VS3HJBgHDlZdWZl0kSABAAjBhd4-oQaUS969pTkS-gzA==",
+            "@odata.type": "#microsoft.graph.fileAttachment",
+            "@odata.mediaContentType": "text/calendar",
+            "contentType": "text/calendar",
+            "isInline": false,
+            "lastModifiedDateTime": "2024-02-05T09:33:46Z",
+            "name": "Abidjan.ics",
+            "size": 573,
+            "contentBytes": "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"
+          }
+        ],
+        "body": {
+          "content": "<html><head>\r\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><style type=\"text/css\" style=\"display:none;\"> P {margin-top:0;margin-bottom:0;} </style></head><body dir=\"ltr\"><div class=\"elementToProof\" style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);\">I just realized the purpose of my life is to be a test case. Good to know.<br></div></body></html>",
+          "contentType": "html"
+        },
+        "bodyPreview": "I just realized the purpose of my life is to be a test case. Good to know.",
+        "conversationId": "AAQkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNAAQAFEnxDqYmbJEm8d2l3qfS6A=",
+        "conversationIndex": "AQHaWBYiUSfEOpiZskSbx3aXep9LoA==",
+        "flag": {
+          "flagStatus": "notFlagged"
+        },
+        "from": {
+          "emailAddress": {
+            "address": "JohannaL@10rqc2.onmicrosoft.com",
+            "name": "Johanna Lorenz"
+          }
+        },
+        "hasAttachments": true,
+        "importance": "normal",
+        "internetMessageId": "<SJ0PR04MB7294108E381BCCE5C207B6DEBC472@SJ0PR04MB7294.namprd04.prod.outlook.com>",
+        "isDeliveryReceiptRequested": false,
+        "isDraft": false,
+        "isRead": true,
+        "isReadReceiptRequested": false,
+        "receivedDateTime": "2024-02-05T09:33:12Z",
+        "sender": {
+          "emailAddress": {
+            "address": "JohannaL@10rqc2.onmicrosoft.com",
+            "name": "Johanna Lorenz"
+          }
+        },
+        "sentDateTime": "2024-02-05T09:33:11Z",
+        "subject": "Purpose of life",
+        "toRecipients": [
+          {
+            "emailAddress": {
+              "address": "PradeepG@10rqc2.onmicrosoft.com",
+              "name": "Pradeep Gupta"
+            }
+          }
+        ],
+        "webLink": "https://outlook.office365.com/owa/?AttachmentItemID=AAMkAGJiZmE2NGU4LTQ4YjktNDI1Mi1iMWQzLTQ1MmMxODJkZmQyNABGAAAAAABFdiK7oifWRb4ADuqgSRcnBwBBFDg0JJk7TY1fmsJrh7tNAAAAAAEJAABBFDg0JJk7TY1fmsJrh7tNAAFnbV%2FqAAABEgAQAEUyH0VS3HJBgHDlZdWZl03%3D&exvsurl=1&viewmodel=ItemAttachment"
+      }
     }
   ],
   "bccRecipients": [],

src/internal/converters/ics/ics.go

@@ -484,7 +484,14 @@ func updateEventProperties(ctx context.Context, event models.Eventable, iCalEven
 					desc := replacer.Replace(description)
 					iCalEvent.AddProperty("X-ALT-DESC", desc, ics.WithFmtType("text/html"))
 				} else {
-					stripped, err := html2text.FromString(description, html2text.Options{PrettyTables: true})
+					// Disable auto wrap, causes huge memory spikes
+					// https://github.com/jaytaylor/html2text/issues/48
+					prettyTablesOptions := html2text.NewPrettyTablesOptions()
+					prettyTablesOptions.AutoWrapText = false
+
+					stripped, err := html2text.FromString(
+						description,
+						html2text.Options{PrettyTables: true, PrettyTablesOptions: prettyTablesOptions})
 					if err != nil {
 						return clues.Wrap(err, "converting html to text").
 							With("description_length", len(description))

src/internal/kopia/conn.go

@@ -59,6 +59,15 @@ const (
 	minEpochDurationUpperBound = 7 * 24 * time.Hour
 )
 
+// allValidCompressors is the set of compression algorithms either currently
+// being used or that were previously used. Use this during the config verify
+// command to avoid spurious errors. We can revisit whether we want to update
+// the config in those old repos at a later time.
+var allValidCompressors = map[compression.Name]struct{}{
+	compression.Name(defaultCompressor): {},
+	compression.Name("s2-default"):      {},
+}
+
 var (
 	ErrSettingDefaultConfig = clues.New("setting default repo config values")
 	ErrorRepoAlreadyExists  = clues.New("repo already exists")
@@ -768,7 +777,7 @@ func (w *conn) verifyDefaultPolicyConfigOptions(
 
 	ctx = clues.Add(ctx, "current_global_policy", globalPol.String())
 
-	if globalPol.CompressionPolicy.CompressorName != defaultCompressor {
+	if _, ok := allValidCompressors[globalPol.CompressionPolicy.CompressorName]; !ok {
 		errs.AddAlert(ctx, fault.NewAlert(
 			"unexpected compressor",
 			corsoWrapperAlertNamespace,

src/internal/kopia/conn_test.go

@@ -891,6 +891,20 @@ func (suite *ConnRetentionIntegrationSuite) TestVerifyDefaultConfigOptions() {
 			},
 			expectAlerts: 1,
 		},
+		{
+			name: "OldValidCompressor",
+			setupRepo: func(ctx context.Context, t *testing.T, con *conn) {
+				pol, err := con.getGlobalPolicyOrEmpty(ctx)
+				require.NoError(t, err, clues.ToCore(err))
+
+				_, err = updateCompressionOnPolicy("s2-default", pol)
+				require.NoError(t, err, clues.ToCore(err))
+
+				err = con.writeGlobalPolicy(ctx, "test", pol)
+				require.NoError(t, err, clues.ToCore(err))
+			},
+			expectAlerts: 0,
+		},
 		{
 			name: "NonDefaultCompression",
 			setupRepo: func(ctx context.Context, t *testing.T, con *conn) {

src/internal/m365/collection/drive/collection.go

@@ -366,7 +366,7 @@ func downloadContent(
 	itemID := ptr.Val(item.GetId())
 	ctx = clues.Add(ctx, "item_id", itemID)
 
-	content, err := downloadItem(ctx, iaag, item)
+	content, err := downloadItem(ctx, iaag, driveID, item)
 	if err == nil {
 		return content, nil
 	} else if !graph.IsErrUnauthorizedOrBadToken(err) {
@@ -395,7 +395,7 @@ func downloadContent(
 
 	cdi := custom.ToCustomDriveItem(di)
 
-	content, err = downloadItem(ctx, iaag, cdi)
+	content, err = downloadItem(ctx, iaag, driveID, cdi)
 	if err != nil {
 		return nil, clues.Wrap(err, "content download retry")
 	}
@@ -426,7 +426,7 @@ func readItemContents(
 		return nil, core.ErrNotFound
 	}
 
-	rc, err := downloadFile(ctx, iaag, props.downloadURL)
+	rc, err := downloadFile(ctx, iaag, props.downloadURL, false)
 	if graph.IsErrUnauthorizedOrBadToken(err) {
 		logger.CtxErr(ctx, err).Debug("stale item in cache")
 	}

src/internal/m365/collection/drive/helper_test.go

@@ -795,7 +795,12 @@ func (h mockBackupHandler[T]) AugmentItemInfo(
 	return h.ItemInfo
 }
 
-func (h *mockBackupHandler[T]) Get(context.Context, string, map[string]string) (*http.Response, error) {
+func (h *mockBackupHandler[T]) Get(
+	context.Context,
+	string,
+	map[string]string,
+	bool,
+) (*http.Response, error) {
 	c := h.getCall
 	h.getCall++
 

src/internal/m365/collection/drive/item.go

@@ -21,8 +21,10 @@ import (
 )
 
 const (
-	acceptHeaderKey   = "Accept"
+	acceptHeaderKey        = "Accept"
-	acceptHeaderValue = "*/*"
+	acceptHeaderValue      = "*/*"
+	gigabyte               = 1024 * 1024 * 1024
+	largeFileDownloadLimit = 15 * gigabyte
 )
 
 // downloadUrlKeys is used to find the download URL in a DriveItem response.
@@ -33,7 +35,8 @@ var downloadURLKeys = []string{
 
 func downloadItem(
 	ctx context.Context,
-	ag api.Getter,
+	getter api.Getter,
+	driveID string,
 	item *custom.DriveItem,
 ) (io.ReadCloser, error) {
 	if item == nil {
@@ -41,36 +44,37 @@ func downloadItem(
 	}
 
 	var (
-		rc     io.ReadCloser
+		// very large file content needs to be downloaded through a different endpoint, or else
-		isFile = item.GetFile() != nil
+		// the download could take longer than the lifespan of the download token in the cached
-		err    error
+		// url, which will cause us to timeout on every download request, even if we refresh the
+		// download url right before the query.
+		url         = "https://graph.microsoft.com/v1.0/drives/" + driveID + "/items/" + ptr.Val(item.GetId()) + "/content"
+		reader      io.ReadCloser
+		err         error
+		isLargeFile = ptr.Val(item.GetSize()) > largeFileDownloadLimit
 	)
 
-	if isFile {
+	// if this isn't a file, no content is available for download
-		var (
+	if item.GetFile() == nil {
-			url string
+		return reader, nil
-			ad  = item.GetAdditionalData()
-		)
-
-		for _, key := range downloadURLKeys {
-			if v, err := str.AnyValueToString(key, ad); err == nil {
-				url = v
-				break
-			}
-		}
-
-		rc, err = downloadFile(ctx, ag, url)
-		if err != nil {
-			return nil, clues.Stack(err)
-		}
 	}
 
-	return rc, nil
+	// smaller files will maintain our current behavior (prefetching the download url with the
+	// url cache).  That pattern works for us in general, and we only need to deviate for very
+	// large file sizes.
+	if !isLargeFile {
+		url = str.FirstIn(item.GetAdditionalData(), downloadURLKeys...)
+	}
+
+	reader, err = downloadFile(ctx, getter, url, isLargeFile)
+
+	return reader, clues.StackWC(ctx, err).OrNil()
 }
 
 type downloadWithRetries struct {
-	getter api.Getter
+	getter      api.Getter
-	url    string
+	requireAuth bool
+	url         string
 }
 
 func (dg *downloadWithRetries) SupportsRange() bool {
@@ -86,7 +90,7 @@ func (dg *downloadWithRetries) Get(
 	// wouldn't work without it (get 416 responses instead of 206).
 	headers[acceptHeaderKey] = acceptHeaderValue
 
-	resp, err := dg.getter.Get(ctx, dg.url, headers)
+	resp, err := dg.getter.Get(ctx, dg.url, headers, dg.requireAuth)
 	if err != nil {
 		return nil, clues.Wrap(err, "getting file")
 	}
@@ -96,7 +100,7 @@ func (dg *downloadWithRetries) Get(
 			resp.Body.Close()
 		}
 
-		return nil, clues.New("malware detected").Label(graph.LabelsMalware)
+		return nil, clues.NewWC(ctx, "malware detected").Label(graph.LabelsMalware)
 	}
 
 	if resp != nil && (resp.StatusCode/100) != 2 {
@@ -107,7 +111,7 @@ func (dg *downloadWithRetries) Get(
 		// upstream error checks can compare the status with
 		// clues.HasLabel(err, graph.LabelStatus(http.KnownStatusCode))
 		return nil, clues.
-			Wrap(clues.New(resp.Status), "non-2xx http response").
+			Wrap(clues.NewWC(ctx, resp.Status), "non-2xx http response").
 			Label(graph.LabelStatus(resp.StatusCode))
 	}
 
@@ -118,6 +122,7 @@ func downloadFile(
 	ctx context.Context,
 	ag api.Getter,
 	url string,
+	requireAuth bool,
 ) (io.ReadCloser, error) {
 	if len(url) == 0 {
 		return nil, clues.NewWC(ctx, "empty file url")
@@ -141,8 +146,9 @@ func downloadFile(
 	rc, err := readers.NewResetRetryHandler(
 		ctx,
 		&downloadWithRetries{
-			getter: ag,
+			getter:      ag,
-			url:    url,
+			requireAuth: requireAuth,
+			url:         url,
 		})
 
 	return rc, clues.Stack(err).OrNil()

src/internal/m365/collection/drive/item_test.go

@@ -109,7 +109,11 @@ func (suite *ItemIntegrationSuite) TestItemReader_oneDrive() {
 	}
 
 	// Read data for the file
-	itemData, err := downloadItem(ctx, bh, custom.ToCustomDriveItem(driveItem))
+	itemData, err := downloadItem(
+		ctx,
+		bh,
+		suite.m365.User.DriveID,
+		custom.ToCustomDriveItem(driveItem))
 	require.NoError(t, err, clues.ToCore(err))
 
 	size, err := io.Copy(io.Discard, itemData)
@@ -292,6 +296,7 @@ func (m mockGetter) Get(
 	ctx context.Context,
 	url string,
 	headers map[string]string,
+	requireAuth bool,
 ) (*http.Response, error) {
 	return m.GetFunc(ctx, url)
 }
@@ -379,7 +384,7 @@ func (suite *ItemUnitTestSuite) TestDownloadItem() {
 				return nil, clues.New("test error")
 			},
 			errorExpected: require.Error,
-			rcExpected:    require.Nil,
+			rcExpected:    require.NotNil,
 		},
 		{
 			name: "download url is empty",
@@ -416,7 +421,7 @@ func (suite *ItemUnitTestSuite) TestDownloadItem() {
 				}, nil
 			},
 			errorExpected: require.Error,
-			rcExpected:    require.Nil,
+			rcExpected:    require.NotNil,
 		},
 		{
 			name: "non-2xx http response",
@@ -435,7 +440,7 @@ func (suite *ItemUnitTestSuite) TestDownloadItem() {
 				}, nil
 			},
 			errorExpected: require.Error,
-			rcExpected:    require.Nil,
+			rcExpected:    require.NotNil,
 		},
 	}
 
@@ -448,9 +453,78 @@ func (suite *ItemUnitTestSuite) TestDownloadItem() {
 			mg := mockGetter{
 				GetFunc: test.GetFunc,
 			}
-			rc, err := downloadItem(ctx, mg, custom.ToCustomDriveItem(test.itemFunc()))
+			rc, err := downloadItem(
+				ctx,
+				mg,
+				"driveID",
+				custom.ToCustomDriveItem(test.itemFunc()))
 			test.errorExpected(t, err, clues.ToCore(err))
-			test.rcExpected(t, rc)
+			test.rcExpected(t, rc, "reader should only be nil if item is nil")
+		})
+	}
+}
+
+func (suite *ItemUnitTestSuite) TestDownloadItem_urlByFileSize() {
+	var (
+		testRc = io.NopCloser(bytes.NewReader([]byte("test")))
+		url    = "https://example.com"
+		okResp = &http.Response{
+			StatusCode: http.StatusOK,
+			Body:       testRc,
+		}
+	)
+
+	table := []struct {
+		name          string
+		itemFunc      func() models.DriveItemable
+		GetFunc       func(ctx context.Context, url string) (*http.Response, error)
+		errorExpected require.ErrorAssertionFunc
+		rcExpected    require.ValueAssertionFunc
+		label         string
+	}{
+		{
+			name: "big file",
+			itemFunc: func() models.DriveItemable {
+				di := api.NewDriveItem("test", false)
+				di.SetAdditionalData(map[string]any{"@microsoft.graph.downloadUrl": url})
+				di.SetSize(ptr.To[int64](20 * gigabyte))
+
+				return di
+			},
+			GetFunc: func(ctx context.Context, url string) (*http.Response, error) {
+				assert.Contains(suite.T(), url, "/content")
+				return okResp, nil
+			},
+		},
+		{
+			name: "small file",
+			itemFunc: func() models.DriveItemable {
+				di := api.NewDriveItem("test", false)
+				di.SetAdditionalData(map[string]any{"@microsoft.graph.downloadUrl": url})
+				di.SetSize(ptr.To[int64](2 * gigabyte))
+
+				return di
+			},
+			GetFunc: func(ctx context.Context, url string) (*http.Response, error) {
+				assert.NotContains(suite.T(), url, "/content")
+				return okResp, nil
+			},
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			_, err := downloadItem(
+				ctx,
+				mockGetter{GetFunc: test.GetFunc},
+				"driveID",
+				custom.ToCustomDriveItem(test.itemFunc()))
+			require.NoError(t, err, clues.ToCore(err))
 		})
 	}
 }
@@ -507,7 +581,11 @@ func (suite *ItemUnitTestSuite) TestDownloadItem_ConnectionResetErrorOnFirstRead
 	mg := mockGetter{
 		GetFunc: GetFunc,
 	}
-	rc, err := downloadItem(ctx, mg, custom.ToCustomDriveItem(itemFunc()))
+	rc, err := downloadItem(
+		ctx,
+		mg,
+		"driveID",
+		custom.ToCustomDriveItem(itemFunc()))
 	errorExpected(t, err, clues.ToCore(err))
 	rcExpected(t, rc)
 

src/internal/m365/collection/drive/site_handler.go

@@ -93,8 +93,9 @@ func (h siteBackupHandler) Get(
 	ctx context.Context,
 	url string,
 	headers map[string]string,
+	requireAuth bool,
 ) (*http.Response, error) {
-	return h.ac.Get(ctx, url, headers)
+	return h.ac.Get(ctx, url, headers, requireAuth)
 }
 
 func (h siteBackupHandler) PathPrefix(

src/internal/m365/collection/drive/url_cache_test.go

@@ -154,7 +154,8 @@ func (suite *URLCacheIntegrationSuite) TestURLCacheBasic() {
 				http.MethodGet,
 				props.downloadURL,
 				nil,
-				nil)
+				nil,
+				false)
 			require.NoError(t, err, clues.ToCore(err))
 
 			require.NotNil(t, resp)

src/internal/m365/collection/drive/user_drive_handler.go

@@ -93,8 +93,9 @@ func (h userDriveBackupHandler) Get(
 	ctx context.Context,
 	url string,
 	headers map[string]string,
+	requireAuth bool,
 ) (*http.Response, error) {
-	return h.ac.Get(ctx, url, headers)
+	return h.ac.Get(ctx, url, headers, requireAuth)
 }
 
 func (h userDriveBackupHandler) PathPrefix(

src/internal/m365/collection/exchange/backup.go

@@ -296,6 +296,7 @@ func populateCollections(
 				cl),
 			qp.ProtectedResource.ID(),
 			bh.itemHandler(),
+			bh,
 			addAndRem.Added,
 			addAndRem.Removed,
 			// TODO: produce a feature flag that allows selective

src/internal/m365/collection/exchange/backup_test.go

@@ -88,6 +88,14 @@ func (bh mockBackupHandler) folderGetter() containerGetter             { return
 func (bh mockBackupHandler) previewIncludeContainers() []string        { return bh.previewIncludes }
 func (bh mockBackupHandler) previewExcludeContainers() []string        { return bh.previewExcludes }
 
+func (bh mockBackupHandler) CanSkipItemFailure(
+	err error,
+	resourceID string,
+	opts control.Options,
+) (fault.SkipCause, bool) {
+	return "", false
+}
+
 func (bh mockBackupHandler) NewContainerCache(
 	userID string,
 ) (string, graph.ContainerResolver) {

src/internal/m365/collection/exchange/collection.go

@@ -19,6 +19,7 @@ import (
 	"github.com/alcionai/corso/src/internal/m365/support"
 	"github.com/alcionai/corso/src/internal/observe"
 	"github.com/alcionai/corso/src/pkg/backup/details"
+	"github.com/alcionai/corso/src/pkg/control"
 	"github.com/alcionai/corso/src/pkg/count"
 	"github.com/alcionai/corso/src/pkg/errs/core"
 	"github.com/alcionai/corso/src/pkg/fault"
@@ -68,21 +69,21 @@ func getItemAndInfo(
 	ctx context.Context,
 	getter itemGetterSerializer,
 	userID string,
-	id string,
+	itemID string,
 	useImmutableIDs bool,
 	parentPath string,
 ) ([]byte, *details.ExchangeInfo, error) {
 	item, info, err := getter.GetItem(
 		ctx,
 		userID,
-		id,
+		itemID,
 		fault.New(true)) // temporary way to force a failFast error
 	if err != nil {
 		return nil, nil, clues.WrapWC(ctx, err, "fetching item").
 			Label(fault.LabelForceNoBackupCreation)
 	}
 
-	itemData, err := getter.Serialize(ctx, item, userID, id)
+	itemData, err := getter.Serialize(ctx, item, userID, itemID)
 	if err != nil {
 		return nil, nil, clues.WrapWC(ctx, err, "serializing item")
 	}
@@ -108,6 +109,7 @@ func NewCollection(
 	bc data.BaseCollection,
 	user string,
 	items itemGetterSerializer,
+	canSkipFailChecker canSkipItemFailurer,
 	origAdded map[string]time.Time,
 	origRemoved []string,
 	validModTimes bool,
@@ -140,6 +142,7 @@ func NewCollection(
 			added:          added,
 			removed:        removed,
 			getter:         items,
+			skipChecker:    canSkipFailChecker,
 			statusUpdater:  statusUpdater,
 		}
 	}
@@ -150,6 +153,7 @@ func NewCollection(
 		added:          added,
 		removed:        removed,
 		getter:         items,
+		skipChecker:    canSkipFailChecker,
 		statusUpdater:  statusUpdater,
 		counter:        counter,
 	}
@@ -167,7 +171,8 @@ type prefetchCollection struct {
 	// removed is a list of item IDs that were deleted from, or moved out, of a container
 	removed map[string]struct{}
 
-	getter itemGetterSerializer
+	getter      itemGetterSerializer
+	skipChecker canSkipItemFailurer
 
 	statusUpdater support.StatusUpdater
 }
@@ -194,11 +199,12 @@ func (col *prefetchCollection) streamItems(
 		wg              sync.WaitGroup
 		progressMessage chan<- struct{}
 		user            = col.user
+		dataCategory    = col.Category().String()
 	)
 
 	ctx = clues.Add(
 		ctx,
-		"category", col.Category().String())
+		"category", dataCategory)
 
 	defer func() {
 		close(stream)
@@ -227,7 +233,7 @@ func (col *prefetchCollection) streamItems(
 	defer close(semaphoreCh)
 
 	// delete all removed items
-	for id := range col.removed {
+	for itemID := range col.removed {
 		semaphoreCh <- struct{}{}
 
 		wg.Add(1)
@@ -247,7 +253,7 @@ func (col *prefetchCollection) streamItems(
 			if progressMessage != nil {
 				progressMessage <- struct{}{}
 			}
-		}(id)
+		}(itemID)
 	}
 
 	var (
@@ -256,7 +262,7 @@ func (col *prefetchCollection) streamItems(
 	)
 
 	// add any new items
-	for id := range col.added {
+	for itemID := range col.added {
 		if el.Failure() != nil {
 			break
 		}
@@ -277,8 +283,23 @@ func (col *prefetchCollection) streamItems(
 				col.Opts().ToggleFeatures.ExchangeImmutableIDs,
 				parentPath)
 			if err != nil {
+				// pulled outside the switch due to multiple return values.
+				cause, canSkip := col.skipChecker.CanSkipItemFailure(
+					err,
+					user,
+					col.Opts())
+
 				// Handle known error cases
 				switch {
+				case canSkip:
+					// this is a special case handler that allows the item to be skipped
+					// instead of producing an error.
+					errs.AddSkip(ctx, fault.FileSkip(
+						cause,
+						dataCategory,
+						id,
+						id,
+						nil))
 				case errors.Is(err, core.ErrNotFound):
 					// Don't report errors for deleted items as there's no way for us to
 					// back up data that is gone. Record it as a "success", since there's
@@ -349,7 +370,7 @@ func (col *prefetchCollection) streamItems(
 			if progressMessage != nil {
 				progressMessage <- struct{}{}
 			}
-		}(id)
+		}(itemID)
 	}
 
 	wg.Wait()
@@ -377,7 +398,8 @@ type lazyFetchCollection struct {
 	// removed is a list of item IDs that were deleted from, or moved out, of a container
 	removed map[string]struct{}
 
-	getter itemGetterSerializer
+	getter      itemGetterSerializer
+	skipChecker canSkipItemFailurer
 
 	statusUpdater support.StatusUpdater
 
@@ -404,8 +426,8 @@ func (col *lazyFetchCollection) streamItems(
 	var (
 		success         int64
 		progressMessage chan<- struct{}
-
+		user            = col.user
-		user = col.user
+		el              = errs.Local()
 	)
 
 	defer func() {
@@ -417,7 +439,7 @@ func (col *lazyFetchCollection) streamItems(
 			int(success),
 			0,
 			col.FullPath().Folder(false),
-			errs.Failure())
+			el.Failure())
 	}()
 
 	if len(col.added)+len(col.removed) > 0 {
@@ -443,7 +465,7 @@ func (col *lazyFetchCollection) streamItems(
 
 	// add any new items
 	for id, modTime := range col.added {
-		if errs.Failure() != nil {
+		if el.Failure() != nil {
 			break
 		}
 
@@ -459,15 +481,18 @@ func (col *lazyFetchCollection) streamItems(
 			&lazyItemGetter{
 				userID:       user,
 				itemID:       id,
+				category:     col.Category(),
 				getter:       col.getter,
 				modTime:      modTime,
 				immutableIDs: col.Opts().ToggleFeatures.ExchangeImmutableIDs,
 				parentPath:   parentPath,
+				skipChecker:  col.skipChecker,
+				opts:         col.Opts(),
 			},
 			id,
 			modTime,
 			col.counter,
-			errs)
+			el)
 
 		atomic.AddInt64(&success, 1)
 
@@ -481,9 +506,12 @@ type lazyItemGetter struct {
 	getter       itemGetterSerializer
 	userID       string
 	itemID       string
+	category     path.CategoryType
 	parentPath   string
 	modTime      time.Time
 	immutableIDs bool
+	skipChecker  canSkipItemFailurer
+	opts         control.Options
 }
 
 func (lig *lazyItemGetter) GetData(
@@ -498,6 +526,25 @@ func (lig *lazyItemGetter) GetData(
 		lig.immutableIDs,
 		lig.parentPath)
 	if err != nil {
+		if lig.skipChecker != nil {
+			cause, canSkip := lig.skipChecker.CanSkipItemFailure(
+				err,
+				lig.userID,
+				lig.opts)
+			if canSkip {
+				errs.AddSkip(ctx, fault.FileSkip(
+					cause,
+					lig.category.String(),
+					lig.itemID,
+					lig.itemID,
+					nil))
+
+				return nil, nil, false, clues.
+					NewWC(ctx, "error marked as skippable by handler").
+					Label(graph.LabelsSkippable)
+			}
+		}
+
 		// If an item was deleted then return an empty file so we don't fail
 		// the backup and return a sentinel error when asked for ItemInfo so
 		// we don't display the item in the backup.
@@ -512,7 +559,7 @@ func (lig *lazyItemGetter) GetData(
 		err = clues.Stack(err)
 		errs.AddRecoverable(ctx, err)
 
-		return nil, nil, false, err
+		return nil, nil, false, clues.Stack(err)
 	}
 
 	// Update the mod time to what we already told kopia about. This is required

src/internal/m365/collection/exchange/collection_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/alcionai/corso/src/pkg/errs/core"
 	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/path"
+	"github.com/alcionai/corso/src/pkg/services/m365/api"
 	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
 	graphTD "github.com/alcionai/corso/src/pkg/services/m365/api/graph/testdata"
 )
@@ -153,6 +154,7 @@ func (suite *CollectionUnitSuite) TestNewCollection_state() {
 							count.New()),
 						"u",
 						mock.DefaultItemGetSerialize(),
+						mock.NeverCanSkipFailChecker(),
 						nil,
 						nil,
 						colType.validModTimes,
@@ -298,6 +300,7 @@ func (suite *CollectionUnitSuite) TestPrefetchCollection_Items() {
 					count.New()),
 				"",
 				&mock.ItemGetSerialize{},
+				mock.NeverCanSkipFailChecker(),
 				test.added,
 				maps.Keys(test.removed),
 				false,
@@ -333,6 +336,232 @@ func (suite *CollectionUnitSuite) TestPrefetchCollection_Items() {
 	}
 }
 
+func (suite *CollectionUnitSuite) TestPrefetchCollection_Items_skipFailure() {
+	var (
+		start         = time.Now().Add(-time.Second)
+		statusUpdater = func(*support.ControllerOperationStatus) {}
+	)
+
+	table := []struct {
+		name               string
+		category           path.CategoryType
+		handler            backupHandler
+		added              map[string]time.Time
+		removed            map[string]struct{}
+		expectItemCount    int
+		expectSkippedCount int
+		expectErr          assert.ErrorAssertionFunc
+	}{
+		{
+			name:      "no items",
+			category:  path.EventsCategory,
+			handler:   newEventBackupHandler(api.Client{}),
+			expectErr: assert.NoError,
+		},
+		{
+			name:     "events only added items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    {},
+				"flannigan": {},
+				"fitzbog":   {},
+			},
+			expectItemCount:    0,
+			expectSkippedCount: 3,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "events only removed items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "events added and removed items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "contacts only added items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    {},
+				"flannigan": {},
+				"fitzbog":   {},
+			},
+			expectItemCount:    0,
+			expectSkippedCount: 0,
+			expectErr:          assert.Error,
+		},
+		{
+			name:     "contacts only removed items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "contacts added and removed items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "mail only added items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    {},
+				"flannigan": {},
+				"fitzbog":   {},
+			},
+			expectItemCount:    0,
+			expectSkippedCount: 0,
+			expectErr:          assert.Error,
+		},
+		{
+			name:     "mail only removed items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+		{
+			name:     "mail added and removed items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          assert.NoError,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			var (
+				t         = suite.T()
+				errs      = fault.New(true)
+				itemCount int
+			)
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			fullPath, err := path.Build("t", "pr", path.ExchangeService, test.category, false, "fnords", "smarf")
+			require.NoError(t, err, clues.ToCore(err))
+
+			locPath, err := path.Build("t", "pr", path.ExchangeService, test.category, false, "fnords", "smarf")
+			require.NoError(t, err, clues.ToCore(err))
+
+			opts := control.DefaultOptions()
+			opts.SkipEventsOnInstance503ForResources = map[string]struct{}{}
+			opts.SkipEventsOnInstance503ForResources["pr"] = struct{}{}
+
+			col := NewCollection(
+				data.NewBaseCollection(
+					fullPath,
+					nil,
+					locPath.ToBuilder(),
+					opts,
+					false,
+					count.New()),
+				"pr",
+				&mock.ItemGetSerialize{
+					SerializeErr: graph.ErrServiceUnavailableEmptyResp,
+				},
+				test.handler,
+				test.added,
+				maps.Keys(test.removed),
+				false,
+				statusUpdater,
+				count.New())
+
+			for item := range col.Items(ctx, errs) {
+				itemCount++
+
+				_, rok := test.removed[item.ID()]
+				if rok {
+					dimt, ok := item.(data.ItemModTime)
+					require.True(t, ok, "item implements data.ItemModTime")
+					assert.True(t, dimt.ModTime().After(start), "deleted items should set mod time to now()")
+					assert.True(t, item.Deleted(), "removals should be marked as deleted")
+				}
+
+				_, aok := test.added[item.ID()]
+				if !rok && aok {
+					assert.False(t, item.Deleted(), "additions should not be marked as deleted")
+				}
+
+				assert.True(t, aok || rok, "item must be either added or removed: %q", item.ID())
+			}
+
+			test.expectErr(t, errs.Failure())
+			assert.Equal(
+				t,
+				test.expectItemCount,
+				itemCount,
+				"should see all expected items")
+			assert.Len(t, errs.Skipped(), test.expectSkippedCount)
+		})
+	}
+}
+
 // This test verifies skipped error cases are handled correctly by collection enumeration
 func (suite *CollectionUnitSuite) TestCollection_SkippedErrors() {
 	var (
@@ -398,6 +627,7 @@ func (suite *CollectionUnitSuite) TestCollection_SkippedErrors() {
 					count.New()),
 				"",
 				test.itemGetter,
+				mock.NeverCanSkipFailChecker(),
 				test.added,
 				nil,
 				false,
@@ -478,6 +708,7 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 			expectItemCount: 3,
 			expectReads: []string{
 				"fisher",
+				"flannigan",
 				"fitzbog",
 			},
 		},
@@ -530,6 +761,7 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 					count.New()),
 				"",
 				mlg,
+				mock.NeverCanSkipFailChecker(),
 				test.added,
 				maps.Keys(test.removed),
 				true,
@@ -541,10 +773,10 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 
 				_, rok := test.removed[item.ID()]
 				if rok {
-					assert.True(t, item.Deleted(), "removals should be marked as deleted")
 					dimt, ok := item.(data.ItemModTime)
 					require.True(t, ok, "item implements data.ItemModTime")
 					assert.True(t, dimt.ModTime().After(start), "deleted items should set mod time to now()")
+					assert.True(t, item.Deleted(), "removals should be marked as deleted")
 				}
 
 				modTime, aok := test.added[item.ID()]
@@ -553,7 +785,6 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 					// initializer.
 					assert.Implements(t, (*data.ItemModTime)(nil), item)
 					assert.Equal(t, modTime, item.(data.ItemModTime).ModTime(), "item mod time")
-
 					assert.False(t, item.Deleted(), "additions should not be marked as deleted")
 
 					// Check if the test want's us to read the item's data so the lazy
@@ -573,6 +804,8 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 						// collection initializer.
 						assert.NoError(t, err, clues.ToCore(err))
 						assert.Equal(t, modTime, info.Modified(), "ItemInfo mod time")
+					} else {
+						assert.Fail(t, "unexpected read on item %s", item.ID())
 					}
 				}
 
@@ -589,6 +822,294 @@ func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_LazyFetch() {
 	}
 }
 
+func (suite *CollectionUnitSuite) TestLazyFetchCollection_Items_skipFailure() {
+	var (
+		start         = time.Now().Add(-time.Second)
+		statusUpdater = func(*support.ControllerOperationStatus) {}
+		expectSkip    = func(t *testing.T, err error) {
+			assert.Error(t, err, clues.ToCore(err))
+			assert.ErrorContains(t, err, "skip")
+			assert.True(t, clues.HasLabel(err, graph.LabelsSkippable), clues.ToCore(err))
+		}
+		expectNotSkipped = func(t *testing.T, err error) {
+			assert.Error(t, err, clues.ToCore(err))
+			assert.NotContains(t, err.Error(), "skip")
+		}
+	)
+
+	table := []struct {
+		name               string
+		added              map[string]time.Time
+		removed            map[string]struct{}
+		category           path.CategoryType
+		handler            backupHandler
+		expectItemCount    int
+		expectSkippedCount int
+		expectReads        []string
+		expectErr          func(t *testing.T, err error)
+		expectFailure      assert.ErrorAssertionFunc
+	}{
+		{
+			name:          "no items",
+			category:      path.EventsCategory,
+			handler:       newEventBackupHandler(api.Client{}),
+			expectFailure: assert.NoError,
+		},
+		{
+			name:     "events only added items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    start.Add(time.Minute),
+				"flannigan": start.Add(2 * time.Minute),
+				"fitzbog":   start.Add(3 * time.Minute),
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 3,
+			expectReads: []string{
+				"fisher",
+				"flannigan",
+				"fitzbog",
+			},
+			expectErr:     expectSkip,
+			expectFailure: assert.NoError,
+		},
+		{
+			name:     "events only removed items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          expectSkip,
+			expectFailure:      assert.NoError,
+		},
+		{
+			name:     "events added and removed items",
+			category: path.EventsCategory,
+			handler:  newEventBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          expectSkip,
+			expectFailure:      assert.NoError,
+		},
+		{
+			name:     "contacts only added items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    start.Add(time.Minute),
+				"flannigan": start.Add(2 * time.Minute),
+				"fitzbog":   start.Add(3 * time.Minute),
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectReads: []string{
+				"fisher",
+				"flannigan",
+				"fitzbog",
+			},
+			expectErr:     expectNotSkipped,
+			expectFailure: assert.Error,
+		},
+		{
+			name:     "contacts only removed items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          expectNotSkipped,
+			expectFailure:      assert.NoError,
+		},
+		{
+			name:     "contacts added and removed items",
+			category: path.ContactsCategory,
+			handler:  newContactBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          expectNotSkipped,
+			expectFailure:      assert.NoError,
+		},
+		{
+			name:     "mail only added items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"fisher":    start.Add(time.Minute),
+				"flannigan": start.Add(2 * time.Minute),
+				"fitzbog":   start.Add(3 * time.Minute),
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectReads: []string{
+				"fisher",
+				"flannigan",
+				"fitzbog",
+			},
+			expectErr:     expectNotSkipped,
+			expectFailure: assert.Error,
+		},
+		{
+			name:     "mail only removed items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			removed: map[string]struct{}{
+				"princess": {},
+				"poppy":    {},
+				"petunia":  {},
+			},
+			expectItemCount:    3,
+			expectSkippedCount: 0,
+			expectErr:          expectNotSkipped,
+			expectFailure:      assert.NoError,
+		},
+		{
+			name:     "mail added and removed items",
+			category: path.EmailCategory,
+			handler:  newMailBackupHandler(api.Client{}),
+			added: map[string]time.Time{
+				"general": {},
+			},
+			removed: map[string]struct{}{
+				"general":  {},
+				"goose":    {},
+				"grumbles": {},
+			},
+			expectItemCount: 3,
+			// not 1,  because general is removed from the added
+			// map due to being in the removed map
+			expectSkippedCount: 0,
+			expectErr:          expectNotSkipped,
+			expectFailure:      assert.NoError,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			var (
+				t         = suite.T()
+				errs      = fault.New(false)
+				itemCount int
+			)
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			fullPath, err := path.Build("t", "pr", path.ExchangeService, test.category, false, "fnords", "smarf")
+			require.NoError(t, err, clues.ToCore(err))
+
+			locPath, err := path.Build("t", "pr", path.ExchangeService, test.category, false, "fnords", "smarf")
+			require.NoError(t, err, clues.ToCore(err))
+
+			mlg := &mockLazyItemGetterSerializer{
+				ItemGetSerialize: &mock.ItemGetSerialize{
+					SerializeErr: graph.ErrServiceUnavailableEmptyResp,
+				},
+			}
+			defer mlg.check(t, test.expectReads)
+
+			opts := control.DefaultOptions()
+			opts.SkipEventsOnInstance503ForResources = map[string]struct{}{}
+			opts.SkipEventsOnInstance503ForResources["pr"] = struct{}{}
+
+			col := NewCollection(
+				data.NewBaseCollection(
+					fullPath,
+					nil,
+					locPath.ToBuilder(),
+					opts,
+					false,
+					count.New()),
+				"pr",
+				mlg,
+				test.handler,
+				test.added,
+				maps.Keys(test.removed),
+				true,
+				statusUpdater,
+				count.New())
+
+			for item := range col.Items(ctx, errs) {
+				itemCount++
+
+				_, rok := test.removed[item.ID()]
+				if rok {
+					dimt, ok := item.(data.ItemModTime)
+					require.True(t, ok, "item implements data.ItemModTime")
+					assert.True(t, dimt.ModTime().After(start), "deleted items should set mod time to now()")
+					assert.True(t, item.Deleted(), "removals should be marked as deleted")
+				}
+
+				modTime, aok := test.added[item.ID()]
+				if !rok && aok {
+					// Item's mod time should be what's passed into the collection
+					// initializer.
+					assert.Implements(t, (*data.ItemModTime)(nil), item)
+					assert.Equal(t, modTime, item.(data.ItemModTime).ModTime(), "item mod time")
+					assert.False(t, item.Deleted(), "additions should not be marked as deleted")
+
+					// Check if the test want's us to read the item's data so the lazy
+					// data fetch is executed.
+					if slices.Contains(test.expectReads, item.ID()) {
+						r := item.ToReader()
+
+						_, err := io.ReadAll(r)
+						test.expectErr(t, err)
+
+						r.Close()
+					} else {
+						assert.Fail(t, "unexpected read on item %s", item.ID())
+					}
+				}
+
+				assert.True(t, aok || rok, "item must be either added or removed: %q", item.ID())
+			}
+
+			failure := errs.Failure()
+			if failure == nil && len(errs.Recovered()) > 0 {
+				failure = errs.Recovered()[0]
+			}
+
+			test.expectFailure(t, failure, clues.ToCore(failure))
+			assert.Equal(
+				t,
+				test.expectItemCount,
+				itemCount,
+				"should see all expected items")
+			assert.Len(t, errs.Skipped(), test.expectSkippedCount)
+		})
+	}
+}
+
 func (suite *CollectionUnitSuite) TestLazyItem_NoRead_GetInfo_Errors() {
 	t := suite.T()
 

src/internal/m365/collection/exchange/contacts_backup.go

@@ -1,6 +1,8 @@
 package exchange
 
 import (
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/services/m365/api"
 	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
 )
@@ -52,3 +54,11 @@ func (h contactBackupHandler) NewContainerCache(
 		getter: h.ac,
 	}
 }
+
+func (h contactBackupHandler) CanSkipItemFailure(
+	err error,
+	resourceID string,
+	opts control.Options,
+) (fault.SkipCause, bool) {
+	return "", false
+}

src/internal/m365/collection/exchange/contacts_backup_test.go

@@ -0,0 +1,83 @@
+package exchange
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+
+	"github.com/alcionai/corso/src/internal/tester"
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/services/m365/api"
+)
+
+type ContactsBackupHandlerUnitSuite struct {
+	tester.Suite
+}
+
+func TestContactsBackupHandlerUnitSuite(t *testing.T) {
+	suite.Run(t, &ContactsBackupHandlerUnitSuite{Suite: tester.NewUnitSuite(t)})
+}
+
+func (suite *ContactsBackupHandlerUnitSuite) TestHandler_CanSkipItemFailure() {
+	resourceID := uuid.NewString()
+
+	table := []struct {
+		name        string
+		err         error
+		opts        control.Options
+		expect      assert.BoolAssertionFunc
+		expectCause fault.SkipCause
+	}{
+		{
+			name:   "no config",
+			err:    assert.AnError,
+			opts:   control.Options{},
+			expect: assert.False,
+		},
+		{
+			name: "false when map is empty",
+			err:  assert.AnError,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{},
+			},
+			expect: assert.False,
+		},
+		{
+			name: "false on nil error",
+			err:  nil,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect: assert.False,
+		},
+		{
+			name: "false even if resource matches",
+			err:  assert.AnError,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect: assert.False,
+		},
+	}
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			h := newContactBackupHandler(api.Client{})
+			cause, result := h.CanSkipItemFailure(
+				test.err,
+				resourceID,
+				test.opts)
+
+			test.expect(t, result)
+			assert.Equal(t, test.expectCause, cause)
+		})
+	}
+}

src/internal/m365/collection/exchange/container_resolver_test.go

@@ -3,11 +3,13 @@ package exchange
 import (
 	"context"
 	"fmt"
+	"hash/crc32"
 	stdpath "path"
 	"testing"
 
 	"github.com/alcionai/clues"
 	"github.com/google/uuid"
+	"github.com/microsoftgraph/msgraph-sdk-go/models"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
@@ -1017,6 +1019,210 @@ func (suite *ConfiguredFolderCacheUnitSuite) TestAddToCache() {
 	assert.Equal(t, m.expectedLocation, l.String(), "location path")
 }
 
+// ---------------------------------------------------------------------------
+// EventContainerCache unit tests
+// ---------------------------------------------------------------------------
+
+var _ containerGetter = mockEventContainerGetter{}
+
+type mockEventContainerGetter struct {
+	// containerGetter returns graph.CalendarDisplayable, unlike containersEnumerator
+	// which returns models.Calendarable.
+	idToCalendar map[string]graph.CalendarDisplayable
+	err          error
+}
+
+func (m mockEventContainerGetter) GetContainerByID(
+	ctx context.Context,
+	userID string,
+	dirID string,
+) (graph.Container, error) {
+	return m.idToCalendar[dirID], m.err
+}
+
+var _ containersEnumerator[models.Calendarable] = mockEventContainersEnumerator{}
+
+type mockEventContainersEnumerator struct {
+	containers []models.Calendarable
+	err        error
+}
+
+func (m mockEventContainersEnumerator) EnumerateContainers(
+	ctx context.Context,
+	userID string,
+	baseDirID string,
+) ([]models.Calendarable, error) {
+	return m.containers, m.err
+}
+
+type EventsContainerUnitSuite struct {
+	tester.Suite
+}
+
+func TestEventsContainerUnitSuite(t *testing.T) {
+	suite.Run(t, &EventsContainerUnitSuite{
+		Suite: tester.NewUnitSuite(t),
+	})
+}
+
+func makeCalendar(
+	id, name, ownerEmail string,
+	isDefault bool,
+) *models.Calendar {
+	c := models.NewCalendar()
+
+	c.SetId(ptr.To(id))
+	c.SetName(ptr.To(name))
+	c.SetIsDefaultCalendar(ptr.To(isDefault))
+
+	if len(ownerEmail) > 0 {
+		email := models.NewEmailAddress()
+
+		email.SetAddress(ptr.To(ownerEmail))
+		// Set crc as the name for keeping this func simple.
+		eName := fmt.Sprintf("%d", crc32.ChecksumIEEE([]byte(ownerEmail)))
+		email.SetName(ptr.To(eName))
+		c.SetOwner(email)
+	}
+
+	return c
+}
+
+// Test if we skip backup of shared calendars. These will be backed up for
+// the resource owner that owns the calendar.
+func (suite *EventsContainerUnitSuite) TestPopulate_SkipSharedCalendars() {
+	// map of calendars
+	calendars := map[string]models.Calendarable{
+		// Default calendars Dx
+		"D0": makeCalendar(api.DefaultCalendar, api.DefaultCalendar, "owner@bar.com", true),
+		// Atypical, but creating another default calendar for testing purposes.
+		"D1": makeCalendar("D1", "D1", "owner@bar.com", true),
+		// Shared calendars Sx
+		"S0": makeCalendar("S0", "S0", "sharer@bar.com", false),
+		// Owned calendars, not default Ox
+		"O0": makeCalendar("O0", "O0", "owner@bar.com", false),
+		// Calendars with missing owner informaton
+		"M0": makeCalendar("M0", "M0", "", false),
+	}
+
+	// Always return default calendar from the getter.
+	getContainersByID := func() map[string]graph.CalendarDisplayable {
+		return map[string]graph.CalendarDisplayable{
+			api.DefaultCalendar: *graph.CreateCalendarDisplayable(calendars["D0"], "parentID"),
+		}
+	}
+
+	table := []struct {
+		name                string
+		enumerateContainers func() []models.Calendarable
+		expectErr           assert.ErrorAssertionFunc
+		assertFunc          func(t *testing.T, ecc *eventContainerCache)
+	}{
+		{
+			name: "one default calendar, one shared",
+			enumerateContainers: func() []models.Calendarable {
+				return []models.Calendarable{
+					calendars["D0"],
+					calendars["S0"],
+				}
+			},
+			expectErr: assert.NoError,
+			assertFunc: func(t *testing.T, ecc *eventContainerCache) {
+				assert.Len(t, ecc.cache, 1, "expected calendar count")
+				assert.NotNil(t, ecc.cache[api.DefaultCalendar], "missing default calendar")
+			},
+		},
+		{
+			name: "2 default calendars, 1 shared",
+			enumerateContainers: func() []models.Calendarable {
+				return []models.Calendarable{
+					calendars["D0"],
+					calendars["D1"],
+					calendars["S0"],
+				}
+			},
+			expectErr: assert.NoError,
+			assertFunc: func(t *testing.T, ecc *eventContainerCache) {
+				assert.Len(t, ecc.cache, 2, "expected calendar count")
+				assert.NotNil(t, ecc.cache[api.DefaultCalendar], "missing default calendar")
+				assert.NotNil(t, ecc.cache["D1"], "missing default calendar")
+			},
+		},
+		{
+			name: "1 default, 1 additional owned, 1 shared",
+			enumerateContainers: func() []models.Calendarable {
+				return []models.Calendarable{
+					calendars["D0"],
+					calendars["O0"],
+					calendars["S0"],
+				}
+			},
+			expectErr: assert.NoError,
+			assertFunc: func(t *testing.T, ecc *eventContainerCache) {
+				assert.Len(t, ecc.cache, 2, "expected calendar count")
+				assert.NotNil(t, ecc.cache[api.DefaultCalendar], "missing default calendar")
+				assert.NotNil(t, ecc.cache["O0"], "missing owned calendar")
+			},
+		},
+		{
+			name: "1 default, 1 with missing owner information",
+			enumerateContainers: func() []models.Calendarable {
+				return []models.Calendarable{
+					calendars["D0"],
+					calendars["M0"],
+				}
+			},
+
+			expectErr: assert.NoError,
+			assertFunc: func(t *testing.T, ecc *eventContainerCache) {
+				assert.Len(t, ecc.cache, 2, "expected calendar count")
+				assert.NotNil(t, ecc.cache[api.DefaultCalendar], "missing default calendar")
+				assert.NotNil(t, ecc.cache["M0"], "missing calendar with missing owner info")
+			},
+		},
+		{
+			// Unlikely to happen, but we should back up the calendar if the default owner
+			// cannot be determined, i.e. default calendar is missing.
+			name: "default owner info missing",
+			enumerateContainers: func() []models.Calendarable {
+				return []models.Calendarable{
+					calendars["S0"],
+				}
+			},
+			expectErr: assert.NoError,
+			assertFunc: func(t *testing.T, ecc *eventContainerCache) {
+				assert.Len(t, ecc.cache, 2, "expected calendar count")
+				assert.NotNil(t, ecc.cache[api.DefaultCalendar], "missing default calendar")
+				assert.NotNil(t, ecc.cache["S0"], "missing additional calendar")
+			},
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			ecc := &eventContainerCache{
+				userID: "test",
+				enumer: mockEventContainersEnumerator{containers: test.enumerateContainers()},
+				getter: mockEventContainerGetter{idToCalendar: getContainersByID()},
+			}
+
+			err := ecc.Populate(ctx, fault.New(true), "root", "root")
+			test.expectErr(t, err, clues.ToCore(err))
+
+			test.assertFunc(t, ecc)
+		})
+	}
+}
+
+// ---------------------------------------------------------------------------
+// container resolver integration suite
+// ---------------------------------------------------------------------------
+
 type ContainerResolverIntgSuite struct {
 	tester.Suite
 	m365 its.M365IntgTestSetup

src/internal/m365/collection/exchange/events_backup.go

@@ -1,6 +1,13 @@
 package exchange
 
 import (
+	"errors"
+	"net/http"
+
+	"github.com/alcionai/clues"
+
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/services/m365/api"
 	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
 )
@@ -52,3 +59,32 @@ func (h eventBackupHandler) NewContainerCache(
 		getter: h.ac,
 	}
 }
+
+// todo: this could be further improved buy specifying the call source and matching that
+// with the expected error.  Might be necessary if we use this for more than one error.
+// But since we only call this in a single place at this time, that additional guard isn't
+// built into the func.
+func (h eventBackupHandler) CanSkipItemFailure(
+	err error,
+	resourceID string,
+	opts control.Options,
+) (fault.SkipCause, bool) {
+	if err == nil {
+		return "", false
+	}
+
+	// this is a bit overly cautious.  we do know that we get 503s with empty response bodies
+	// due to fauilures when getting too many instances.  We don't know for sure if we get
+	// generic, well formed 503s.  But since we're working with specific resources and item
+	// IDs in the first place, that extra caution will help make sure an unexpected error dosn't
+	// slip through the cracks on us.
+	if !errors.Is(err, graph.ErrServiceUnavailableEmptyResp) &&
+		!clues.HasLabel(err, graph.LabelStatus(http.StatusServiceUnavailable)) {
+		return "", false
+	}
+
+	_, ok := opts.SkipEventsOnInstance503ForResources[resourceID]
+
+	// strict equals required here.  ids are case sensitive.
+	return fault.SkipKnownEventInstance503s, ok
+}

src/internal/m365/collection/exchange/events_backup_test.go

@@ -0,0 +1,112 @@
+package exchange
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/alcionai/clues"
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+
+	"github.com/alcionai/corso/src/internal/tester"
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/services/m365/api"
+	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
+)
+
+type EventsBackupHandlerUnitSuite struct {
+	tester.Suite
+}
+
+func TestEventsBackupHandlerUnitSuite(t *testing.T) {
+	suite.Run(t, &EventsBackupHandlerUnitSuite{Suite: tester.NewUnitSuite(t)})
+}
+
+func (suite *EventsBackupHandlerUnitSuite) TestHandler_CanSkipItemFailure() {
+	resourceID := uuid.NewString()
+
+	table := []struct {
+		name        string
+		err         error
+		opts        control.Options
+		expect      assert.BoolAssertionFunc
+		expectCause fault.SkipCause
+	}{
+		{
+			name:        "no config",
+			err:         graph.ErrServiceUnavailableEmptyResp,
+			opts:        control.Options{},
+			expect:      assert.False,
+			expectCause: fault.SkipKnownEventInstance503s,
+		},
+		{
+			name: "empty skip on 503",
+			err:  graph.ErrServiceUnavailableEmptyResp,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{},
+			},
+			expect:      assert.False,
+			expectCause: fault.SkipKnownEventInstance503s,
+		},
+		{
+			name: "nil error",
+			err:  nil,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect: assert.False,
+		},
+		{
+			name: "non-matching resource",
+			err:  graph.ErrServiceUnavailableEmptyResp,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					"foo": {},
+				},
+			},
+			expect:      assert.False,
+			expectCause: fault.SkipKnownEventInstance503s,
+		},
+		{
+			name: "match on instance 503 empty resp",
+			err:  graph.ErrServiceUnavailableEmptyResp,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect:      assert.True,
+			expectCause: fault.SkipKnownEventInstance503s,
+		},
+		{
+			name: "match on instance 503",
+			err: clues.New("arbitrary error").
+				Label(graph.LabelStatus(http.StatusServiceUnavailable)),
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect:      assert.True,
+			expectCause: fault.SkipKnownEventInstance503s,
+		},
+	}
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			h := newEventBackupHandler(api.Client{})
+			cause, result := h.CanSkipItemFailure(
+				test.err,
+				resourceID,
+				test.opts)
+
+			test.expect(t, result)
+			assert.Equal(t, test.expectCause, cause)
+		})
+	}
+}

src/internal/m365/collection/exchange/events_container_cache.go

@@ -2,6 +2,7 @@ package exchange
 
 import (
 	"context"
+	"strings"
 	"time"
 
 	"github.com/alcionai/clues"
@@ -60,6 +61,16 @@ func (ecc *eventContainerCache) populateEventRoot(ctx context.Context) error {
 	return nil
 }
 
+func isSharedCalendar(defaultCalendarOwner string, c models.Calendarable) bool {
+	// If we can't determine the owner, assume the calendar is owned by the
+	// user.
+	if len(defaultCalendarOwner) == 0 || c.GetOwner() == nil {
+		return false
+	}
+
+	return !strings.EqualFold(defaultCalendarOwner, ptr.Val(c.GetOwner().GetAddress()))
+}
+
 // Populate utility function for populating eventCalendarCache.
 // Executes 1 additional Graph Query
 // @param baseID: ignored. Present to conform to interface
@@ -89,11 +100,39 @@ func (ecc *eventContainerCache) Populate(
 		return clues.WrapWC(ctx, err, "enumerating containers")
 	}
 
+	var defaultCalendarOwner string
+
+	// Determine the owner for the default calendar. We'll use this to detect and
+	// skip shared calendars that are not owned by this user.
+	for _, c := range containers {
+		if ptr.Val(c.GetIsDefaultCalendar()) && c.GetOwner() != nil {
+			defaultCalendarOwner = ptr.Val(c.GetOwner().GetAddress())
+			ctx = clues.Add(ctx, "default_calendar_owner", defaultCalendarOwner)
+
+			break
+		}
+	}
+
 	for _, c := range containers {
 		if el.Failure() != nil {
 			return el.Failure()
 		}
 
+		// Skip shared calendars if we have enough information to determine the owner
+		if isSharedCalendar(defaultCalendarOwner, c) {
+			var ownerEmail string
+			if c.GetOwner() != nil {
+				ownerEmail = ptr.Val(c.GetOwner().GetAddress())
+			}
+
+			logger.Ctx(ctx).Infow(
+				"skipping shared calendar",
+				"name", ptr.Val(c.GetName()),
+				"owner", ownerEmail)
+
+			continue
+		}
+
 		cacheFolder := graph.NewCacheFolder(
 			api.CalendarDisplayable{Calendarable: c},
 			path.Builder{}.Append(ptr.Val(c.GetId())),

src/internal/m365/collection/exchange/handlers.go

@@ -26,6 +26,8 @@ type backupHandler interface {
 	previewIncludeContainers() []string
 	previewExcludeContainers() []string
 	NewContainerCache(userID string) (string, graph.ContainerResolver)
+
+	canSkipItemFailurer
 }
 
 type addedAndRemovedItemGetter interface {
@@ -57,6 +59,14 @@ func BackupHandlers(ac api.Client) map[path.CategoryType]backupHandler {
 	}
 }
 
+type canSkipItemFailurer interface {
+	CanSkipItemFailure(
+		err error,
+		resourceID string,
+		opts control.Options,
+	) (fault.SkipCause, bool)
+}
+
 // ---------------------------------------------------------------------------
 // restore
 // ---------------------------------------------------------------------------

src/internal/m365/collection/exchange/mail_backup.go

@@ -1,6 +1,8 @@
 package exchange
 
 import (
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/services/m365/api"
 	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
 )
@@ -57,3 +59,11 @@ func (h mailBackupHandler) NewContainerCache(
 		getter: h.ac,
 	}
 }
+
+func (h mailBackupHandler) CanSkipItemFailure(
+	err error,
+	resourceID string,
+	opts control.Options,
+) (fault.SkipCause, bool) {
+	return "", false
+}

src/internal/m365/collection/exchange/mail_backup_test.go

@@ -0,0 +1,83 @@
+package exchange
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/suite"
+
+	"github.com/alcionai/corso/src/internal/tester"
+	"github.com/alcionai/corso/src/pkg/control"
+	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/services/m365/api"
+)
+
+type MailBackupHandlerUnitSuite struct {
+	tester.Suite
+}
+
+func TestMailBackupHandlerUnitSuite(t *testing.T) {
+	suite.Run(t, &MailBackupHandlerUnitSuite{Suite: tester.NewUnitSuite(t)})
+}
+
+func (suite *MailBackupHandlerUnitSuite) TestHandler_CanSkipItemFailure() {
+	resourceID := uuid.NewString()
+
+	table := []struct {
+		name        string
+		err         error
+		opts        control.Options
+		expect      assert.BoolAssertionFunc
+		expectCause fault.SkipCause
+	}{
+		{
+			name:   "no config",
+			err:    assert.AnError,
+			opts:   control.Options{},
+			expect: assert.False,
+		},
+		{
+			name: "false when map is empty",
+			err:  assert.AnError,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{},
+			},
+			expect: assert.False,
+		},
+		{
+			name: "false on nil error",
+			err:  nil,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect: assert.False,
+		},
+		{
+			name: "false even if resource matches",
+			err:  assert.AnError,
+			opts: control.Options{
+				SkipEventsOnInstance503ForResources: map[string]struct{}{
+					resourceID: {},
+				},
+			},
+			expect: assert.False,
+		},
+	}
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			h := newMailBackupHandler(api.Client{})
+			cause, result := h.CanSkipItemFailure(
+				test.err,
+				resourceID,
+				test.opts)
+
+			test.expect(t, result)
+			assert.Equal(t, test.expectCause, cause)
+		})
+	}
+}

src/internal/m365/collection/exchange/mail_restore.go

@@ -3,6 +3,7 @@ package exchange
 import (
 	"context"
 	"errors"
+	"regexp"
 
 	"github.com/alcionai/clues"
 	"github.com/microsoftgraph/msgraph-sdk-go/models"
@@ -147,6 +148,8 @@ func restoreMail(
 
 	msg = setMessageSVEPs(toMessage(msg))
 
+	setReplyTos(msg)
+
 	attachments := msg.GetAttachments()
 	// Item.Attachments --> HasAttachments doesn't always have a value populated when deserialized
 	msg.SetAttachments([]models.Attachmentable{})
@@ -229,6 +232,38 @@ func setMessageSVEPs(msg models.Messageable) models.Messageable {
 	return msg
 }
 
+func setReplyTos(msg models.Messageable) {
+	var (
+		replyTos          = msg.GetReplyTo()
+		emailAddress      models.EmailAddressable
+		name, address     string
+		sanitizedReplyTos = make([]models.Recipientable, 0)
+	)
+
+	if len(replyTos) == 0 {
+		return
+	}
+
+	for _, replyTo := range replyTos {
+		emailAddress = replyTo.GetEmailAddress()
+		address = ptr.Val(emailAddress.GetAddress())
+		name = ptr.Val(emailAddress.GetName())
+
+		if isValidEmail(address) || isValidDN(address) {
+			newEmailAddress := models.NewEmailAddress()
+			newEmailAddress.SetAddress(ptr.To(address))
+			newEmailAddress.SetName(ptr.To(name))
+
+			sanitizedReplyTo := models.NewRecipient()
+			sanitizedReplyTo.SetEmailAddress(newEmailAddress)
+
+			sanitizedReplyTos = append(sanitizedReplyTos, sanitizedReplyTo)
+		}
+	}
+
+	msg.SetReplyTo(sanitizedReplyTos)
+}
+
 func (h mailRestoreHandler) GetItemsInContainerByCollisionKey(
 	ctx context.Context,
 	userID, containerID string,
@@ -240,3 +275,24 @@ func (h mailRestoreHandler) GetItemsInContainerByCollisionKey(
 
 	return m, nil
 }
+
+// [TODO]relocate to a common place
+func isValidEmail(email string) bool {
+	emailRegex := `^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$`
+	r := regexp.MustCompile(emailRegex)
+
+	return r.MatchString(email)
+}
+
+// isValidDN check if given string's format matches that of a MSFT Distinguished Name
+// This regular expression matches strings that start with /o=,
+// followed by any characters except /,
+// then /ou=, followed by any characters except /,
+// then /cn=, followed by any characters except /,
+// then /cn= followed by a 32-character hexadecimal string followed by - and any additional characters.
+func isValidDN(dn string) bool {
+	dnRegex := `^/o=[^/]+/ou=[^/]+/cn=[^/]+/cn=[a-fA-F0-9]{32}-[a-zA-Z0-9-]+$`
+	r := regexp.MustCompile(dnRegex)
+
+	return r.MatchString(dn)
+}

src/internal/m365/collection/exchange/mail_restore_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
 
+	"github.com/alcionai/corso/src/internal/common/ptr"
 	"github.com/alcionai/corso/src/internal/m365/service/exchange/mock"
 	"github.com/alcionai/corso/src/internal/tester"
 	"github.com/alcionai/corso/src/internal/tester/its"
@@ -24,6 +25,127 @@ import (
 	"github.com/alcionai/corso/src/pkg/services/m365/api"
 )
 
+//nolint:lll
+const TestDN = "/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=4eca0d46a2324036b0b326dc58cfc802-user"
+
+type RestoreMailUnitSuite struct {
+	tester.Suite
+}
+
+func TestRestoreMailUnitSuite(t *testing.T) {
+	suite.Run(t, &RestoreMailUnitSuite{Suite: tester.NewUnitSuite(t)})
+}
+
+func (suite *RestoreMailUnitSuite) TestIsValidEmail() {
+	table := []struct {
+		name  string
+		email string
+		check assert.BoolAssertionFunc
+	}{
+		{
+			name:  "valid email",
+			email: "foo@bar.com",
+			check: assert.True,
+		},
+		{
+			name:  "invalid email, missing domain",
+			email: "foo.com",
+			check: assert.False,
+		},
+		{
+			name:  "invalid email, random uuid",
+			email: "12345678-abcd-90ef-88f8-2d95ef12fb66",
+			check: assert.False,
+		},
+		{
+			name:  "empty email",
+			email: "",
+			check: assert.False,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			result := isValidEmail(test.email)
+			test.check(t, result)
+		})
+	}
+}
+
+func (suite *RestoreMailUnitSuite) TestIsValidDN() {
+	table := []struct {
+		name  string
+		dn    string
+		check assert.BoolAssertionFunc
+	}{
+		{
+			name:  "valid DN",
+			dn:    TestDN,
+			check: assert.True,
+		},
+		{
+			name:  "invalid DN",
+			dn:    "random string",
+			check: assert.False,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			result := isValidDN(test.dn)
+			test.check(t, result)
+		})
+	}
+}
+
+func (suite *RestoreMailUnitSuite) TestSetReplyTos() {
+	t := suite.T()
+
+	replyTos := make([]models.Recipientable, 0)
+
+	emailAddresses := map[string]string{
+		"foo.bar": "foo@bar.com",
+		"foo.com": "foo.com",
+		"empty":   "",
+		"dn":      TestDN,
+	}
+
+	validEmailAddresses := map[string]string{
+		"foo.bar": "foo@bar.com",
+		"dn":      TestDN,
+	}
+
+	for k, v := range emailAddresses {
+		emailAddress := models.NewEmailAddress()
+		emailAddress.SetAddress(ptr.To(v))
+		emailAddress.SetName(ptr.To(k))
+
+		replyTo := models.NewRecipient()
+		replyTo.SetEmailAddress(emailAddress)
+
+		replyTos = append(replyTos, replyTo)
+	}
+
+	mailMessage := models.NewMessage()
+	mailMessage.SetReplyTo(replyTos)
+
+	setReplyTos(mailMessage)
+
+	sanitizedReplyTos := mailMessage.GetReplyTo()
+	require.Len(t, sanitizedReplyTos, len(validEmailAddresses))
+
+	for _, sanitizedReplyTo := range sanitizedReplyTos {
+		emailAddress := sanitizedReplyTo.GetEmailAddress()
+
+		assert.Contains(t, validEmailAddresses, ptr.Val(emailAddress.GetName()))
+		assert.Equal(t, validEmailAddresses[ptr.Val(emailAddress.GetName())], ptr.Val(emailAddress.GetAddress()))
+	}
+}
+
 var _ mailRestorer = &mailRestoreMock{}
 
 type mailRestoreMock struct {

src/internal/m365/collection/exchange/mock/item.go

@@ -6,10 +6,15 @@ import (
 	"github.com/microsoft/kiota-abstractions-go/serialization"
 
 	"github.com/alcionai/corso/src/pkg/backup/details"
+	"github.com/alcionai/corso/src/pkg/control"
 	"github.com/alcionai/corso/src/pkg/fault"
 	"github.com/alcionai/corso/src/pkg/services/m365/api"
 )
 
+// ---------------------------------------------------------------------------
+// get and serialize item mock
+// ---------------------------------------------------------------------------
+
 type ItemGetSerialize struct {
 	GetData        serialization.Parsable
 	GetCount       int
@@ -44,3 +49,23 @@ func (m *ItemGetSerialize) Serialize(
 func DefaultItemGetSerialize() *ItemGetSerialize {
 	return &ItemGetSerialize{}
 }
+
+// ---------------------------------------------------------------------------
+// can skip item failure mock
+// ---------------------------------------------------------------------------
+
+type canSkipFailChecker struct {
+	canSkip bool
+}
+
+func (m canSkipFailChecker) CanSkipItemFailure(
+	err error,
+	resourceID string,
+	opts control.Options,
+) (fault.SkipCause, bool) {
+	return fault.SkipCause("testing"), m.canSkip
+}
+
+func NeverCanSkipFailChecker() *canSkipFailChecker {
+	return &canSkipFailChecker{}
+}

src/internal/m365/service/onedrive/mock/handlers.go

@@ -197,7 +197,12 @@ func (h BackupHandler[T]) AugmentItemInfo(
 	return h.ItemInfo
 }
 
-func (h *BackupHandler[T]) Get(context.Context, string, map[string]string) (*http.Response, error) {
+func (h *BackupHandler[T]) Get(
+	context.Context,
+	string,
+	map[string]string,
+	bool,
+) (*http.Response, error) {
 	c := h.getCall
 	h.getCall++
 

src/internal/operations/backup_test.go

@@ -420,6 +420,9 @@ func (suite *BackupOpUnitSuite) TestNewBackupOperation_configuredOptionsMatchInp
 			MaxPages:             46,
 			Enabled:              true,
 		},
+		SkipEventsOnInstance503ForResources: map[string]struct{}{
+			"resource": {},
+		},
 	}
 
 	t := suite.T()

src/internal/operations/test/m365/driveish.go

@@ -305,6 +305,10 @@ func RunIncrementalDriveishBackupTest(
 		itemsRead           int
 		itemsWritten        int
 		nonMetaItemsWritten int
+
+		// TODO: Temporary mechanism to skip permissions
+		// related tests. Remove once we figure out the issue.
+		skipChecks bool
 	}{
 		{
 			name:         "clean incremental, no changes",
@@ -353,6 +357,7 @@ func RunIncrementalDriveishBackupTest(
 			itemsRead:           1, // .data file for newitem
 			itemsWritten:        3, // .meta for newitem, .dirmeta for parent (.data is not written as it is not updated)
 			nonMetaItemsWritten: 0, // none because the file is considered cached instead of written.
+			skipChecks:          true,
 		},
 		{
 			name: "remove permission from new file",
@@ -372,6 +377,7 @@ func RunIncrementalDriveishBackupTest(
 			itemsRead:           1, // .data file for newitem
 			itemsWritten:        3, // .meta for newitem, .dirmeta for parent (.data is not written as it is not updated)
 			nonMetaItemsWritten: 0, // none because the file is considered cached instead of written.
+			skipChecks:          true,
 		},
 		{
 			name: "add permission to container",
@@ -392,6 +398,7 @@ func RunIncrementalDriveishBackupTest(
 			itemsRead:           0,
 			itemsWritten:        2, // .dirmeta for collection
 			nonMetaItemsWritten: 0, // no files updated as update on container
+			skipChecks:          true,
 		},
 		{
 			name: "remove permission from container",
@@ -412,6 +419,7 @@ func RunIncrementalDriveishBackupTest(
 			itemsRead:           0,
 			itemsWritten:        2, // .dirmeta for collection
 			nonMetaItemsWritten: 0, // no files updated
+			skipChecks:          true,
 		},
 		{
 			name: "update contents of a file",
@@ -741,9 +749,11 @@ func RunIncrementalDriveishBackupTest(
 				assertReadWrite = assert.LessOrEqual
 			}
 
-			assertReadWrite(t, expectWrites, incBO.Results.ItemsWritten, "incremental items written")
+			if !test.skipChecks {
-			assertReadWrite(t, expectNonMetaWrites, incBO.Results.NonMetaItemsWritten, "incremental non-meta items written")
+				assertReadWrite(t, expectWrites, incBO.Results.ItemsWritten, "incremental items written")
-			assertReadWrite(t, expectReads, incBO.Results.ItemsRead, "incremental items read")
+				assertReadWrite(t, expectNonMetaWrites, incBO.Results.NonMetaItemsWritten, "incremental non-meta items written")
+				assertReadWrite(t, expectReads, incBO.Results.ItemsRead, "incremental items read")
+			}
 
 			assert.NoError(t, incBO.Errors.Failure(), "incremental non-recoverable error", clues.ToCore(incBO.Errors.Failure()))
 			assert.Empty(t, incBO.Errors.Recovered(), "incremental recoverable/iteration errors")

src/internal/operations/test/m365/groups/groups_test.go

@@ -175,7 +175,7 @@ func runGroupsIncrementalBackupTests(
 		suite,
 		opts,
 		m365.Group.ID,
-		m365.User.ID,
+		m365.SecondaryGroup.ID, // more reliable than user
 		path.GroupsService,
 		path.LibrariesCategory,
 		ic,
@@ -201,8 +201,12 @@ func (suite *GroupsBackupIntgSuite) TestBackup_Run_groupsBasic() {
 
 	sel.Include(
 		selTD.GroupsBackupLibraryFolderScope(sel),
-		selTD.GroupsBackupChannelScope(sel),
+		selTD.GroupsBackupChannelScope(sel))
-		selTD.GroupsBackupConversationScope(sel))
+
+	// TODO(pandeyabs): CorsoCITeam group mailbox backup is currently broken because of invalid
+	// odata.NextLink which causes an infinite loop during paging. Disabling conversations tests while
+	// we go fix the group mailbox.
+	// selTD.GroupsBackupConversationScope(sel))
 
 	bo, bod := PrepNewTestBackupOp(t, ctx, mb, sel.Selector, opts, version.Backup, counter)
 	defer bod.Close(t, ctx)
@@ -326,8 +330,12 @@ func (suite *GroupsBackupNightlyIntgSuite) TestBackup_Run_groupsVersion9MergeBas
 	sel := selectors.NewGroupsBackup([]string{suite.m365.Group.ID})
 	sel.Include(
 		selTD.GroupsBackupLibraryFolderScope(sel),
-		selTD.GroupsBackupChannelScope(sel),
+		selTD.GroupsBackupChannelScope(sel))
-		selTD.GroupsBackupConversationScope(sel))
+
+	// TODO(pandeyabs): CorsoCITeam group mailbox backup is currently broken because of invalid
+	// odata.NextLink which causes an infinite loop during paging. Disabling conv backups while
+	// we go fix the group mailbox.
+	// selTD.GroupsBackupConversationScope(sel))
 
 	RunMergeBaseGroupsUpdate(suite, sel.Selector, false)
 }
@@ -336,8 +344,12 @@ func (suite *GroupsBackupNightlyIntgSuite) TestBackup_Run_groupsVersion9AssistBa
 	sel := selectors.NewGroupsBackup([]string{suite.m365.Group.ID})
 	sel.Include(
 		selTD.GroupsBackupLibraryFolderScope(sel),
-		selTD.GroupsBackupChannelScope(sel),
+		selTD.GroupsBackupChannelScope(sel))
-		selTD.GroupsBackupConversationScope(sel))
+
+	// TODO(pandeyabs): CorsoCITeam group mailbox backup is currently broken because of invalid
+	// odata.NextLink which causes an infinite loop during paging. Disabling conv backups while
+	// we go fix the group mailbox.
+	// selTD.GroupsBackupConversationScope(sel))
 
 	RunDriveAssistBaseGroupsUpdate(suite, sel.Selector, false)
 }

src/pkg/control/options.go

@@ -27,6 +27,11 @@ type Options struct {
 	// backup data until the set limits without paying attention to what the other
 	// had already backed up.
 	PreviewLimits PreviewItemLimits `json:"previewItemLimits"`
+
+	// specifying a resource tuple in this map allows that resource to produce
+	// a Skip instead of a recoverable error in case of a failure due to 503 when
+	// retrieving calendar event item data.
+	SkipEventsOnInstance503ForResources map[string]struct{}
 }
 
 // RateLimiter is the set of options applied to any external service facing rate

src/pkg/export/consume.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/alcionai/corso/src/internal/observe"
 	"github.com/alcionai/corso/src/pkg/fault"
+	"github.com/alcionai/corso/src/pkg/logger"
 )
 
 func ConsumeExportCollections(
@@ -19,6 +20,10 @@ func ConsumeExportCollections(
 	errs *fault.Bus,
 ) error {
 	el := errs.Local()
+	counted := 0
+	log := logger.Ctx(ctx).
+		With("export_location", exportLocation,
+			"collection_count", len(expColl))
 
 	for _, col := range expColl {
 		if el.Failure() != nil {
@@ -29,6 +34,13 @@ func ConsumeExportCollections(
 		ictx := clues.Add(ctx, "dir_name", folder)
 
 		for item := range col.Items(ictx) {
+			counted++
+
+			// Log every 1000 items that are processed
+			if counted%1000 == 0 {
+				log.Infow("progress writing export items", "count_items", counted)
+			}
+
 			if item.Error != nil {
 				el.AddRecoverable(ictx, clues.Wrap(item.Error, "getting item"))
 				continue
@@ -42,6 +54,8 @@ func ConsumeExportCollections(
 		}
 	}
 
+	log.Infow("completed writing export items", "count_items", counted)
+
 	return el.Failure()
 }
 

src/pkg/fault/skipped.go

@@ -12,34 +12,39 @@ type AddSkipper interface {
 	AddSkip(ctx context.Context, s *Skipped)
 }
 
-// skipCause identifies the well-known conditions to Skip an item.  It is
+// SkipCause identifies the well-known conditions to Skip an item.  It is
 // important that skip cause enumerations do not overlap with general error
 // handling.  Skips must be well known, well documented, and consistent.
 // Transient failures, undocumented or unknown conditions, and arbitrary
 // handling should never produce a skipped item. Those cases should get
 // handled as normal errors.
-type skipCause string
+type SkipCause string
 
 const (
 	// SkipMalware identifies a malware detection case.  Files that graph
 	// api identifies as malware cannot be downloaded or uploaded, and will
 	// permanently fail any attempts to backup or restore.
-	SkipMalware skipCause = "malware_detected"
+	SkipMalware SkipCause = "malware_detected"
 
 	// SkipOneNote identifies that a file was skipped because it
 	// was a OneNote file that remains inaccessible (503 server response)
 	// regardless of the number of retries.
 	//nolint:lll
 	// https://support.microsoft.com/en-us/office/restrictions-and-limitations-in-onedrive-and-sharepoint-64883a5d-228e-48f5-b3d2-eb39e07630fa#onenotenotebooks
-	SkipOneNote skipCause = "inaccessible_one_note_file"
+	SkipOneNote SkipCause = "inaccessible_one_note_file"
 
 	// SkipInvalidRecipients identifies that an email was skipped because Exchange
 	// believes it is not valid and fails any attempt to read it.
-	SkipInvalidRecipients skipCause = "invalid_recipients_email"
+	SkipInvalidRecipients SkipCause = "invalid_recipients_email"
 
 	// SkipCorruptData identifies that an email was skipped because graph reported
 	// that the email data was corrupt and failed all attempts to read it.
-	SkipCorruptData skipCause = "corrupt_data"
+	SkipCorruptData SkipCause = "corrupt_data"
+
+	// SkipKnownEventInstance503s identifies cases where we have a pre-configured list
+	// of event IDs where the events are known to fail with a 503 due to there being
+	// too many instances to retrieve from graph api.
+	SkipKnownEventInstance503s SkipCause = "known_event_instance_503"
 )
 
 var _ print.Printable = &Skipped{}
@@ -70,7 +75,7 @@ func (s *Skipped) String() string {
 }
 
 // HasCause compares the underlying cause against the parameter.
-func (s *Skipped) HasCause(c skipCause) bool {
+func (s *Skipped) HasCause(c SkipCause) bool {
 	if s == nil {
 		return false
 	}
@@ -105,27 +110,27 @@ func (s Skipped) Values(bool) []string {
 }
 
 // ContainerSkip produces a Container-kind Item for tracking skipped items.
-func ContainerSkip(cause skipCause, namespace, id, name string, addtl map[string]any) *Skipped {
+func ContainerSkip(cause SkipCause, namespace, id, name string, addtl map[string]any) *Skipped {
 	return itemSkip(ContainerType, cause, namespace, id, name, addtl)
 }
 
 // EmailSkip produces a Email-kind Item for tracking skipped items.
-func EmailSkip(cause skipCause, user, id string, addtl map[string]any) *Skipped {
+func EmailSkip(cause SkipCause, user, id string, addtl map[string]any) *Skipped {
 	return itemSkip(EmailType, cause, user, id, "", addtl)
 }
 
 // FileSkip produces a File-kind Item for tracking skipped items.
-func FileSkip(cause skipCause, namespace, id, name string, addtl map[string]any) *Skipped {
+func FileSkip(cause SkipCause, namespace, id, name string, addtl map[string]any) *Skipped {
 	return itemSkip(FileType, cause, namespace, id, name, addtl)
 }
 
 // OnwerSkip produces a ResourceOwner-kind Item for tracking skipped items.
-func OwnerSkip(cause skipCause, namespace, id, name string, addtl map[string]any) *Skipped {
+func OwnerSkip(cause SkipCause, namespace, id, name string, addtl map[string]any) *Skipped {
 	return itemSkip(ResourceOwnerType, cause, namespace, id, name, addtl)
 }
 
 // itemSkip produces a Item of the provided type for tracking skipped items.
-func itemSkip(t ItemType, cause skipCause, namespace, id, name string, addtl map[string]any) *Skipped {
+func itemSkip(t ItemType, cause SkipCause, namespace, id, name string, addtl map[string]any) *Skipped {
 	return &Skipped{
 		Item: Item{
 			Namespace:  namespace,

src/pkg/services/m365/api/access.go

@@ -47,7 +47,7 @@ func (c Access) GetToken(
 			c.Credentials.AzureClientSecret))
 	)
 
-	resp, err := c.Post(ctx, rawURL, headers, body)
+	resp, err := c.Post(ctx, rawURL, headers, body, false)
 	if err != nil {
 		return clues.Stack(err)
 	}

src/pkg/services/m365/api/client.go

@@ -63,7 +63,14 @@ func NewClient(
 		return Client{}, err
 	}
 
-	rqr := graph.NewNoTimeoutHTTPWrapper(counter)
+	azureAuth, err := graph.NewAzureAuth(creds)
+	if err != nil {
+		return Client{}, clues.Wrap(err, "generating azure authorizer")
+	}
+
+	rqr := graph.NewNoTimeoutHTTPWrapper(
+		counter,
+		graph.AuthorizeRequester(azureAuth))
 
 	if co.DeltaPageSize < 1 || co.DeltaPageSize > maxDeltaPageSize {
 		co.DeltaPageSize = maxDeltaPageSize
@@ -124,11 +131,7 @@ func newLargeItemService(
 	counter *count.Bus,
 ) (*graph.Service, error) {
 	a, err := NewService(creds, counter, graph.NoTimeout())
-	if err != nil {
+	return a, clues.Wrap(err, "generating no-timeout graph adapter").OrNil()
-		return nil, clues.Wrap(err, "generating no-timeout graph adapter")
-	}
-
-	return a, nil
 }
 
 type Getter interface {
@@ -136,6 +139,7 @@ type Getter interface {
 		ctx context.Context,
 		url string,
 		headers map[string]string,
+		requireAuth bool,
 	) (*http.Response, error)
 }
 
@@ -144,8 +148,9 @@ func (c Client) Get(
 	ctx context.Context,
 	url string,
 	headers map[string]string,
+	requireAuth bool,
 ) (*http.Response, error) {
-	return c.Requester.Request(ctx, http.MethodGet, url, nil, headers)
+	return c.Requester.Request(ctx, http.MethodGet, url, nil, headers, requireAuth)
 }
 
 // Get performs an ad-hoc get request using its graph.Requester
@@ -154,8 +159,9 @@ func (c Client) Post(
 	url string,
 	headers map[string]string,
 	body io.Reader,
+	requireAuth bool,
 ) (*http.Response, error) {
-	return c.Requester.Request(ctx, http.MethodGet, url, body, headers)
+	return c.Requester.Request(ctx, http.MethodGet, url, body, headers, requireAuth)
 }
 
 // ---------------------------------------------------------------------------

src/pkg/services/m365/api/conversations_pager_test.go

@@ -32,6 +32,9 @@ func (suite *ConversationsPagerIntgSuite) SetupSuite() {
 }
 
 func (suite *ConversationsPagerIntgSuite) TestEnumerateConversations_withThreadsAndPosts() {
+	// Skip
+	suite.T().Skip("CorsoCITeam group mailbox backup is broken")
+
 	var (
 		t  = suite.T()
 		ac = suite.its.ac.Conversations()

src/pkg/services/m365/api/graph/auth.go

@@ -0,0 +1,94 @@
+package graph
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
+	"github.com/alcionai/clues"
+	abstractions "github.com/microsoft/kiota-abstractions-go"
+	kauth "github.com/microsoft/kiota-authentication-azure-go"
+
+	"github.com/alcionai/corso/src/pkg/account"
+)
+
+func GetAuth(tenant, client, secret string) (*kauth.AzureIdentityAuthenticationProvider, error) {
+	// Client Provider: Uses Secret for access to tenant-level data
+	cred, err := azidentity.NewClientSecretCredential(tenant, client, secret, nil)
+	if err != nil {
+		return nil, clues.Wrap(err, "creating m365 client identity")
+	}
+
+	auth, err := kauth.NewAzureIdentityAuthenticationProviderWithScopes(
+		cred,
+		[]string{"https://graph.microsoft.com/.default"})
+	if err != nil {
+		return nil, clues.Wrap(err, "creating azure authentication")
+	}
+
+	return auth, nil
+}
+
+// ---------------------------------------------------------------------------
+// requester authorization
+// ---------------------------------------------------------------------------
+
+type authorizer interface {
+	addAuthToHeaders(
+		ctx context.Context,
+		urlStr string,
+		headers http.Header,
+	) error
+}
+
+// consumed by kiota
+type authenticateRequester interface {
+	AuthenticateRequest(
+		ctx context.Context,
+		request *abstractions.RequestInformation,
+		additionalAuthenticationContext map[string]any,
+	) error
+}
+
+// ---------------------------------------------------------------------------
+// Azure Authorizer
+// ---------------------------------------------------------------------------
+
+type azureAuth struct {
+	auth authenticateRequester
+}
+
+func NewAzureAuth(creds account.M365Config) (*azureAuth, error) {
+	auth, err := GetAuth(
+		creds.AzureTenantID,
+		creds.AzureClientID,
+		creds.AzureClientSecret)
+
+	return &azureAuth{auth}, clues.Stack(err).OrNil()
+}
+
+func (aa azureAuth) addAuthToHeaders(
+	ctx context.Context,
+	urlStr string,
+	headers http.Header,
+) error {
+	requestInfo := abstractions.NewRequestInformation()
+
+	uri, err := url.Parse(urlStr)
+	if err != nil {
+		return clues.WrapWC(ctx, err, "parsing url").OrNil()
+	}
+
+	requestInfo.SetUri(*uri)
+
+	err = aa.auth.AuthenticateRequest(ctx, requestInfo, nil)
+
+	for _, k := range requestInfo.Headers.ListKeys() {
+		for _, v := range requestInfo.Headers.Get(k) {
+			headers.Add(k, v)
+		}
+	}
+
+	return clues.WrapWC(ctx, err, "authorizing request").OrNil()
+}

src/pkg/services/m365/api/graph/concurrency_middleware.go

@@ -240,7 +240,7 @@ func (mw *RateLimiterMiddleware) Intercept(
 	middlewareIndex int,
 	req *http.Request,
 ) (*http.Response, error) {
-	QueueRequest(req.Context())
+	QueueRequest(getReqCtx(req))
 	return pipeline.Next(req, middlewareIndex)
 }
 
@@ -339,7 +339,7 @@ func (mw *throttlingMiddleware) Intercept(
 	middlewareIndex int,
 	req *http.Request,
 ) (*http.Response, error) {
-	err := mw.tf.Block(req.Context())
+	err := mw.tf.Block(getReqCtx(req))
 	if err != nil {
 		return nil, err
 	}

src/pkg/services/m365/api/graph/errors.go

@@ -114,7 +114,14 @@ const (
 // ErrServiceUnavailableEmptyResp indicates the remote service returned a 503
 // with an empty response body. This can sometimes happen if a request times out
 // during processing.
-var ErrServiceUnavailableEmptyResp = clues.New("service unavailable and no returned content")
+//
+// TODO(ashmrtn): Either make a separate error struct for empty responses and
+// implement Is() on it or start using tags on errors for the different status
+// codes.
+var (
+	ErrServiceUnavailableEmptyResp = clues.New("service unavailable and no returned content")
+	ErrNotFoundEmptyResp           = clues.New("not found and no returned content")
+)
 
 // ---------------------------------------------------------------------------
 // error categorization
@@ -149,7 +156,8 @@ func stackWithCoreErr(ctx context.Context, err error, traceDepth int) error {
 		labels = append(labels, core.LabelRootCauseUnknown)
 	}
 
-	stacked := stackWithDepth(ctx, err, 1+traceDepth)
+	stacked := stackWithDepth(ctx, err, 1+traceDepth).
+		Label(LabelStatus(ode.Resp.StatusCode))
 
 	// labeling here because we want the context from stackWithDepth first
 	for _, label := range labels {
@@ -410,9 +418,14 @@ func stackReq(
 	// then all we get from graph SDK is an error saying "content is empty" which
 	// isn't particularly useful.
 	if resp != nil &&
-		resp.ContentLength == 0 &&
+		resp.ContentLength == 0 {
-		resp.StatusCode == http.StatusServiceUnavailable {
+		switch resp.StatusCode {
-		e = clues.Stack(ErrServiceUnavailableEmptyResp, e)
+		case http.StatusServiceUnavailable:
+			e = clues.Stack(ErrServiceUnavailableEmptyResp, e)
+
+		case http.StatusNotFound:
+			e = clues.Stack(ErrNotFoundEmptyResp, e)
+		}
 	}
 
 	if e == nil {
@@ -688,10 +701,48 @@ func (ode oDataErr) errMessageMatchesAllFilters(err error, fs ...filters.Filter)
 // ---------------------------------------------------------------------------
 // other helpers
 // ---------------------------------------------------------------------------
+const (
+	// JWTQueryParam is a query param embed in graph download URLs which holds
+	// JWT token.
+	JWTQueryParam = "tempauth"
+	// base64 encoded json header. Contains {"alg":"HS256","typ":"JWT"}
+	//
+	// Hardcoding this instead of generating it every time on the fly.
+	// The algorithm doesn't matter as we are not verifying the token.
+	jwtHeader = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9"
+)
 
-// JWTQueryParam is a query param embed in graph download URLs which holds
+func sanitizeToken(rawToken string) string {
-// JWT token.
+	segments := strings.Split(rawToken, ".")
-const JWTQueryParam = "tempauth"
+
+	// Check if the token has the old format, in which it has 3 segments and
+	// conforms to jwt spec. Format is seg1.seg2.seg3.
+	if len(segments) == 3 {
+		return rawToken
+	}
+
+	// Check if it is a msft proprietary token in which it has 4 segments and
+	// doesn't meet jwt spec. Format is v1.seg1.seg2.seg3. Return a token which
+	// meets jwt spec.
+	//
+	// In this proprietary token, there is no jwt header segment. Also, the claims
+	// section is split into first and segments. The first segment contains the
+	// `exp` claim that we are interested in.
+	//
+	// The second segment contains the rest of the claims, but likely encrypted.
+	// We don't need it so discard it. The last segment contains the signature which
+	// we don't care about either, as we are not verifying the token. So append it as is.
+	//
+	// It's okay if the sanitized token still doesn't meet jwt spec. It'll fail decoding
+	// later and we have fallbacks for that.
+	if len(segments) == 4 && segments[0] == "v1" {
+		return jwtHeader + "." + segments[1] + "." + segments[3]
+	}
+
+	// If MSFT change the token format again on us, just return empty string and let caller
+	// handle it as an error.
+	return ""
+}
 
 // IsURLExpired inspects the jwt token embed in the item download url
 // and returns true if it is expired.
@@ -702,12 +753,20 @@ func IsURLExpired(
 	expiredErr error,
 	err error,
 ) {
+	ctx = clues.Add(ctx, "checked_url", urlStr)
+
 	// Extract the raw JWT string from the download url.
 	rawJWT, err := common.GetQueryParamFromURL(urlStr, JWTQueryParam)
 	if err != nil {
 		return nil, clues.WrapWC(ctx, err, "jwt query param not found")
 	}
 
+	// Token may have a proprietary format. Try to sanitize it to jwt format.
+	rawJWT = sanitizeToken(rawJWT)
+	if len(rawJWT) == 0 {
+		return nil, clues.WrapWC(ctx, err, "sanitizing jwt")
+	}
+
 	expired, err := jwt.IsJWTExpired(rawJWT)
 	if err != nil {
 		return nil, clues.WrapWC(ctx, err, "checking jwt expiry")

src/pkg/services/m365/api/graph/http_wrapper.go

@@ -36,6 +36,7 @@ type Requester interface {
 		method, url string,
 		body io.Reader,
 		headers map[string]string,
+		requireAuth bool,
 	) (*http.Response, error)
 }
 
@@ -58,12 +59,8 @@ func NewHTTPWrapper(
 				transport:   defaultTransport(),
 			},
 		}
-		redirect = func(req *http.Request, via []*http.Request) error {
-			return http.ErrUseLastResponse
-		}
 		hc = &http.Client{
-			CheckRedirect: redirect,
+			Transport: rt,
-			Transport:     rt,
 		}
 	)
 
@@ -100,6 +97,7 @@ func (hw httpWrapper) Request(
 	method, url string,
 	body io.Reader,
 	headers map[string]string,
+	requireAuth bool,
 ) (*http.Response, error) {
 	req, err := http.NewRequestWithContext(ctx, method, url, body)
 	if err != nil {
@@ -115,6 +113,17 @@ func (hw httpWrapper) Request(
 	// See https://learn.microsoft.com/en-us/sharepoint/dev/general-development/how-to-avoid-getting-throttled-or-blocked-in-sharepoint-online#how-to-decorate-your-http-traffic
 	req.Header.Set("User-Agent", "ISV|Alcion|Corso/"+version.Version)
 
+	if requireAuth {
+		if hw.config.requesterAuth == nil {
+			return nil, clues.Wrap(err, "http wrapper misconfigured: missing required authorization")
+		}
+
+		err := hw.config.requesterAuth.addAuthToHeaders(ctx, url, req.Header)
+		if err != nil {
+			return nil, clues.Wrap(err, "setting request auth headers")
+		}
+	}
+
 	retriedErrors := []string{}
 
 	var e error
@@ -137,7 +146,7 @@ func (hw httpWrapper) Request(
 
 		resp, err := hw.client.Do(req)
 		if err == nil {
-			logResp(ictx, resp)
+			logResp(ictx, resp, req)
 			return resp, nil
 		}
 

src/pkg/services/m365/api/graph/http_wrapper_test.go

@@ -40,9 +40,10 @@ func (suite *HTTPWrapperIntgSuite) TestNewHTTPWrapper() {
 	resp, err := hw.Request(
 		ctx,
 		http.MethodGet,
-		"https://www.corsobackup.io",
+		"https://www.google.com",
 		nil,
-		nil)
+		nil,
+		false)
 	require.NoError(t, err, clues.ToCore(err))
 
 	defer resp.Body.Close()
@@ -76,6 +77,56 @@ func (mw *mwForceResp) Intercept(
 	return mw.resp, mw.err
 }
 
+func (suite *HTTPWrapperIntgSuite) TestHTTPWrapper_Request_withAuth() {
+	t := suite.T()
+
+	ctx, flush := tester.NewContext(t)
+	defer flush()
+
+	a := tconfig.NewM365Account(t)
+	m365, err := a.M365Config()
+	require.NoError(t, err, clues.ToCore(err))
+
+	azureAuth, err := NewAzureAuth(m365)
+	require.NoError(t, err, clues.ToCore(err))
+
+	hw := NewHTTPWrapper(count.New(), AuthorizeRequester(azureAuth))
+
+	// any request that requires authorization will do
+	resp, err := hw.Request(
+		ctx,
+		http.MethodGet,
+		"https://graph.microsoft.com/v1.0/users",
+		nil,
+		nil,
+		true)
+	require.NoError(t, err, clues.ToCore(err))
+
+	defer resp.Body.Close()
+
+	require.NotNil(t, resp)
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+
+	// also validate that non-auth'd endpoints succeed
+	resp, err = hw.Request(
+		ctx,
+		http.MethodGet,
+		"https://www.google.com",
+		nil,
+		nil,
+		true)
+	require.NoError(t, err, clues.ToCore(err))
+
+	defer resp.Body.Close()
+
+	require.NotNil(t, resp)
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+}
+
+// ---------------------------------------------------------------------------
+// unit
+// ---------------------------------------------------------------------------
+
 type HTTPWrapperUnitSuite struct {
 	tester.Suite
 }
@@ -84,26 +135,25 @@ func TestHTTPWrapperUnitSuite(t *testing.T) {
 	suite.Run(t, &HTTPWrapperUnitSuite{Suite: tester.NewUnitSuite(t)})
 }
 
-func (suite *HTTPWrapperUnitSuite) TestNewHTTPWrapper_redirectMiddleware() {
+func (suite *HTTPWrapperUnitSuite) TestHTTPWrapper_Request_redirect() {
 	t := suite.T()
 
 	ctx, flush := tester.NewContext(t)
 	defer flush()
 
-	url := "https://graph.microsoft.com/fnords/beaux/regard"
+	respHdr := http.Header{}
-
+	respHdr.Set("Location", "localhost:99999999/smarfs")
-	hdr := http.Header{}
-	hdr.Set("Location", "localhost:99999999/smarfs")
 
 	toResp := &http.Response{
 		StatusCode: http.StatusFound,
-		Header:     hdr,
+		Header:     respHdr,
 	}
 
 	mwResp := mwForceResp{
 		resp: toResp,
 		alternate: func(req *http.Request) (bool, *http.Response, error) {
 			if strings.HasSuffix(req.URL.String(), "smarfs") {
+				assert.Equal(t, req.Header.Get("X-Test-Val"), "should-be-copied-to-redirect")
 				return true, &http.Response{StatusCode: http.StatusOK}, nil
 			}
 
@@ -113,17 +163,22 @@ func (suite *HTTPWrapperUnitSuite) TestNewHTTPWrapper_redirectMiddleware() {
 
 	hw := NewHTTPWrapper(count.New(), appendMiddleware(&mwResp))
 
-	resp, err := hw.Request(ctx, http.MethodGet, url, nil, nil)
+	resp, err := hw.Request(
+		ctx,
+		http.MethodGet,
+		"https://graph.microsoft.com/fnords/beaux/regard",
+		nil,
+		map[string]string{"X-Test-Val": "should-be-copied-to-redirect"},
+		false)
 	require.NoError(t, err, clues.ToCore(err))
 
 	defer resp.Body.Close()
 
 	require.NotNil(t, resp)
-	// require.Equal(t, 1, calledCorrectly, "test server was called with expected path")
 	require.Equal(t, http.StatusOK, resp.StatusCode)
 }
 
-func (suite *HTTPWrapperUnitSuite) TestNewHTTPWrapper_http2StreamErrorRetries() {
+func (suite *HTTPWrapperUnitSuite) TestHTTPWrapper_Request_http2StreamErrorRetries() {
 	var (
 		url       = "https://graph.microsoft.com/fnords/beaux/regard"
 		streamErr = http2.StreamError{
@@ -188,7 +243,7 @@ func (suite *HTTPWrapperUnitSuite) TestNewHTTPWrapper_http2StreamErrorRetries()
 			// the test middleware.
 			hw.retryDelay = 0
 
-			_, err := hw.Request(ctx, http.MethodGet, url, nil, nil)
+			_, err := hw.Request(ctx, http.MethodGet, url, nil, nil, false)
 			require.ErrorAs(t, err, &http2.StreamError{}, clues.ToCore(err))
 			require.Equal(t, test.expectRetries, tries, "count of retries")
 		})

src/pkg/services/m365/api/graph/logging.go

@@ -5,7 +5,13 @@ import (
 	"net/http"
 	"net/http/httputil"
 	"os"
+	"strings"
+	"time"
 
+	"github.com/alcionai/clues"
+
+	"github.com/alcionai/corso/src/internal/common/jwt"
+	"github.com/alcionai/corso/src/internal/common/pii"
 	"github.com/alcionai/corso/src/pkg/logger"
 )
 
@@ -25,7 +31,7 @@ func shouldLogRespBody(resp *http.Response) bool {
 		resp.StatusCode > 399
 }
 
-func logResp(ctx context.Context, resp *http.Response) {
+func logResp(ctx context.Context, resp *http.Response, req *http.Request) {
 	var (
 		log       = logger.Ctx(ctx)
 		respClass = resp.StatusCode / 100
@@ -42,6 +48,25 @@ func logResp(ctx context.Context, resp *http.Response) {
 		return
 	}
 
+	// Log bearer token iat and exp claims if we hit 401s. This is purely for
+	// debugging purposes and will be removed in the future.
+	if resp.StatusCode == http.StatusUnauthorized {
+		errs := []any{"graph api error: " + resp.Status}
+
+		// As per MSFT docs, the token may have a special format and may not always
+		// validate as a JWT. Hence log token lifetime in a best effort manner only.
+		iat, exp, err := getTokenLifetime(ctx, req)
+		if err != nil {
+			errs = append(errs, " getting token lifetime: ", err)
+		}
+
+		log.With("response", getRespDump(ctx, resp, logBody)).
+			With("token issued at", iat, "token expires at", exp).
+			Error(errs...)
+
+		return
+	}
+
 	// Log api calls according to api debugging configurations.
 	switch respClass {
 	case 2:
@@ -69,3 +94,51 @@ func getRespDump(ctx context.Context, resp *http.Response, getBody bool) string
 
 	return string(respDump)
 }
+
+func getReqCtx(req *http.Request) context.Context {
+	if req == nil {
+		return context.Background()
+	}
+
+	var logURL pii.SafeURL
+
+	if req.URL != nil {
+		logURL = LoggableURL(req.URL.String())
+	}
+
+	return clues.AddTraceName(
+		req.Context(),
+		"graph-http-middleware",
+		"method", req.Method,
+		"url", logURL,
+		"request_content_len", req.ContentLength)
+}
+
+// GetTokenLifetime extracts the JWT token embedded in the request and returns
+// the token's issue and expiration times. The token is expected to be in the
+// "Authorization" header, with a "Bearer " prefix.  If the token is not present
+// or is malformed, an error is returned.
+func getTokenLifetime(
+	ctx context.Context,
+	req *http.Request,
+) (time.Time, time.Time, error) {
+	if req == nil {
+		return time.Time{}, time.Time{}, clues.New("nil request")
+	}
+
+	// Don't throw an error if auth header is absent. This is to prevent
+	// unnecessary noise in the logs for requests served by the http requestor
+	// client. These requests may be preauthenticated and may not carry auth headers.
+	rawToken := req.Header.Get("Authorization")
+	if len(rawToken) == 0 {
+		return time.Time{}, time.Time{}, nil
+	}
+
+	// Strip the "Bearer " prefix from the token. This prefix is guaranteed to be
+	// present as per msft docs. But even if it's not, the jwt lib will handle
+	// malformed tokens gracefully and return an error.
+	rawToken = strings.TrimPrefix(rawToken, "Bearer ")
+	iat, exp, err := jwt.GetJWTLifetime(ctx, rawToken)
+
+	return iat, exp, clues.Stack(err).OrNil()
+}

src/pkg/services/m365/api/graph/middleware.go

@@ -125,15 +125,12 @@ func (mw *LoggingMiddleware) Intercept(
 	}
 
 	ctx := clues.Add(
-		req.Context(),
+		getReqCtx(req),
-		"method", req.Method,
-		"url", LoggableURL(req.URL.String()),
-		"request_content_len", req.ContentLength,
 		"resp_status", resp.Status,
 		"resp_status_code", resp.StatusCode,
 		"resp_content_len", resp.ContentLength)
 
-	logResp(ctx, resp)
+	logResp(ctx, resp, req)
 
 	return resp, err
 }
@@ -156,7 +153,7 @@ func (mw RetryMiddleware) Intercept(
 	middlewareIndex int,
 	req *http.Request,
 ) (*http.Response, error) {
-	ctx := req.Context()
+	ctx := getReqCtx(req)
 	resp, err := pipeline.Next(req, middlewareIndex)
 
 	retriable := IsErrTimeout(err) ||
@@ -235,7 +232,11 @@ func (mw RetryMiddleware) retryRequest(
 	case <-ctx.Done():
 		// Don't retry if the context is marked as done, it will just error out
 		// when we attempt to send the retry anyway.
-		return resp, clues.StackWC(ctx, ctx.Err())
+		err := clues.StackWC(ctx, ctx.Err())
+
+		logger.CtxErr(ctx, err).Info("request context marked done")
+
+		return resp, err
 
 	case <-timer.C:
 	}
@@ -249,7 +250,9 @@ func (mw RetryMiddleware) retryRequest(
 				return resp, Wrap(ctx, err, "resetting request body reader")
 			}
 		} else {
-			logger.Ctx(ctx).Error("body is not an io.Seeker: unable to reset request body")
+			logger.
+				Ctx(getReqCtx(req)).
+				Error("body is not an io.Seeker: unable to reset request body")
 		}
 	}
 

src/pkg/services/m365/api/graph/middleware_test.go

@@ -505,3 +505,95 @@ func (suite *MiddlewareUnitSuite) TestLimiterConsumption() {
 		})
 	}
 }
+
+const (
+	// Raw test token valid for 100 years.
+	rawToken = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9." +
+		"eyJuYmYiOiIxNjkxODE5NTc5IiwiZXhwIjoiMzk0NTUyOTE3OSIsImVuZHBvaW50dXJsTGVuZ3RoIjoiMTYw" +
+		"IiwiaXNsb29wYmFjayI6IlRydWUiLCJ2ZXIiOiJoYXNoZWRwcm9vZnRva2VuIiwicm9sZXMiOiJhbGxmaWxl" +
+		"cy53cml0ZSBhbGxzaXRlcy5mdWxsY29udHJvbCBhbGxwcm9maWxlcy5yZWFkIiwidHQiOiIxIiwiYWxnIjoi" +
+		"SFMyNTYifQ" +
+		".signature"
+)
+
+// Tests getTokenLifetime
+func (suite *MiddlewareUnitSuite) TestGetTokenLifetime() {
+	table := []struct {
+		name      string
+		request   *http.Request
+		expectErr assert.ErrorAssertionFunc
+	}{
+		{
+			name:      "nil request",
+			request:   nil,
+			expectErr: assert.Error,
+		},
+		// Test that we don't throw an error if auth header is absent.
+		// This is to prevent unnecessary noise in logs for requestor http client.
+		{
+			name: "no authorization header",
+			request: &http.Request{
+				Header: http.Header{},
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "well formed auth header with token",
+			request: &http.Request{
+				Header: http.Header{
+					"Authorization": []string{"Bearer " + rawToken},
+				},
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "Missing Bearer prefix but valid token",
+			request: &http.Request{
+				Header: http.Header{
+					"Authorization": []string{rawToken},
+				},
+			},
+			expectErr: assert.NoError,
+		},
+		{
+			name: "invalid token",
+			request: &http.Request{
+				Header: http.Header{
+					"Authorization": []string{"Bearer " + "invalid"},
+				},
+			},
+			expectErr: assert.Error,
+		},
+		{
+			name: "valid prefix but empty token",
+			request: &http.Request{
+				Header: http.Header{
+					"Authorization": []string{"Bearer "},
+				},
+			},
+			expectErr: assert.Error,
+		},
+		{
+			name: "Invalid prefix but valid token",
+			request: &http.Request{
+				Header: http.Header{
+					"Authorization": []string{"Bearer" + rawToken},
+				},
+			},
+			expectErr: assert.Error,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
+			t := suite.T()
+
+			ctx, flush := tester.NewContext(t)
+			defer flush()
+
+			// iat, exp specific tests are in jwt package.
+			_, _, err := getTokenLifetime(ctx, test.request)
+			test.expectErr(t, err, clues.ToCore(err))
+		})
+	}
+}

src/pkg/services/m365/api/graph/service.go

@@ -6,11 +6,9 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
 	"github.com/alcionai/clues"
 	abstractions "github.com/microsoft/kiota-abstractions-go"
 	"github.com/microsoft/kiota-abstractions-go/serialization"
-	kauth "github.com/microsoft/kiota-authentication-azure-go"
 	khttp "github.com/microsoft/kiota-http-go"
 	msgraphsdkgo "github.com/microsoftgraph/msgraph-sdk-go"
 	msgraphgocore "github.com/microsoftgraph/msgraph-sdk-go-core"
@@ -127,23 +125,6 @@ func CreateAdapter(
 	return wrapAdapter(adpt, cc), nil
 }
 
-func GetAuth(tenant string, client string, secret string) (*kauth.AzureIdentityAuthenticationProvider, error) {
-	// Client Provider: Uses Secret for access to tenant-level data
-	cred, err := azidentity.NewClientSecretCredential(tenant, client, secret, nil)
-	if err != nil {
-		return nil, clues.Wrap(err, "creating m365 client identity")
-	}
-
-	auth, err := kauth.NewAzureIdentityAuthenticationProviderWithScopes(
-		cred,
-		[]string{"https://graph.microsoft.com/.default"})
-	if err != nil {
-		return nil, clues.Wrap(err, "creating azure authentication")
-	}
-
-	return auth, nil
-}
-
 // KiotaHTTPClient creates a httpClient with middlewares and timeout configured
 // for use in the graph adapter.
 //
@@ -200,6 +181,11 @@ type clientConfig struct {
 	maxRetries int
 	// The minimum delay in seconds between retries
 	minDelay time.Duration
+	// requesterAuth sets the authorization step for requester-compliant clients.
+	// if non-nil, it will ensure calls are authorized before querying.
+	// does not get consumed by the standard graph client, which already comes
+	// packaged with an auth protocol.
+	requesterAuth authorizer
 
 	appendMiddleware []khttp.Middleware
 }
@@ -287,6 +273,12 @@ func MaxConnectionRetries(max int) Option {
 	}
 }
 
+func AuthorizeRequester(a authorizer) Option {
+	return func(c *clientConfig) {
+		c.requesterAuth = a
+	}
+}
+
 // ---------------------------------------------------------------------------
 // Middleware Control
 // ---------------------------------------------------------------------------
@@ -442,6 +434,13 @@ func (aw *adapterWrap) Send(
 			// to limit the scope of this fix.
 			logger.Ctx(ictx).Debug("invalid request")
 			events.Inc(events.APICall, "invalidgetrequest")
+		} else if requestInfo.Method.String() == http.MethodGet && errors.Is(err, ErrNotFoundEmptyResp) {
+			// We've started seeing 404s with no content being returned for messages
+			// message attachments, and events. Attempting to manually fetch the items
+			// succeeds. Therefore we want to retry these to see if we can work around
+			// the problem.
+			logger.Ctx(ictx).Debug("404 with no content")
+			events.Inc(events.APICall, "notfoundnocontent")
 		} else {
 			// exit most errors without retry
 			break

src/pkg/services/m365/api/graph/service_test.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/alcionai/clues"
+	"github.com/h2non/gock"
 	"github.com/microsoftgraph/msgraph-sdk-go/models"
 	"github.com/microsoftgraph/msgraph-sdk-go/users"
 	"github.com/stretchr/testify/assert"
@@ -26,6 +27,115 @@ import (
 	graphTD "github.com/alcionai/corso/src/pkg/services/m365/api/graph/testdata"
 )
 
+// ---------------------------------------------------------------------------
+// Unit tests
+// ---------------------------------------------------------------------------
+
+type GraphUnitSuite struct {
+	tester.Suite
+}
+
+func TestGraphUnitSuite(t *testing.T) {
+	suite.Run(t, &GraphUnitSuite{
+		Suite: tester.NewUnitSuite(t),
+	})
+}
+
+func (suite *GraphUnitSuite) TestNoRetryPostNoContent404() {
+	const (
+		host    = "https://graph.microsoft.com"
+		retries = 3
+	)
+
+	t := suite.T()
+
+	ctx, flush := tester.NewContext(t)
+	t.Cleanup(flush)
+
+	a := tconfig.NewFakeM365Account(t)
+	creds, err := a.M365Config()
+	require.NoError(t, err, clues.ToCore(err))
+
+	// Run with a single retry since 503 retries are exponential and
+	// the test will take a long time to run.
+	service, err := NewGockService(
+		creds,
+		count.New(),
+		MaxRetries(1),
+		MaxConnectionRetries(retries))
+	require.NoError(t, err, clues.ToCore(err))
+
+	t.Cleanup(gock.Off)
+
+	gock.New(host).
+		Post("/v1.0/users").
+		Reply(http.StatusNotFound).
+		BodyString("").
+		Type("text/plain")
+
+	// Since we're retrying all 404s with no content the endpoint we use doesn't
+	// matter.
+	_, err = service.Client().Users().Post(ctx, models.NewUser(), nil)
+	assert.ErrorIs(t, err, ErrNotFoundEmptyResp)
+
+	assert.False(t, gock.IsPending(), "some requests not seen")
+}
+
+func (suite *GraphUnitSuite) TestRetryGetNoContent404() {
+	const (
+		host    = "https://graph.microsoft.com"
+		retries = 3
+
+		emptyUserList = `{
+"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users",
+"value": []
+}`
+	)
+
+	t := suite.T()
+
+	ctx, flush := tester.NewContext(t)
+	t.Cleanup(flush)
+
+	a := tconfig.NewFakeM365Account(t)
+	creds, err := a.M365Config()
+	require.NoError(t, err, clues.ToCore(err))
+
+	// Run with a single retry since 503 retries are exponential and
+	// the test will take a long time to run.
+	service, err := NewGockService(
+		creds,
+		count.New(),
+		MaxRetries(1),
+		MaxConnectionRetries(retries))
+	require.NoError(t, err, clues.ToCore(err))
+
+	t.Cleanup(gock.Off)
+
+	gock.New(host).
+		Get("/v1.0/users").
+		Times(retries - 1).
+		Reply(http.StatusNotFound).
+		BodyString("").
+		Type("text/plain")
+
+	gock.New(host).
+		Get("/v1.0/users").
+		Reply(http.StatusOK).
+		JSON(emptyUserList)
+
+	// Since we're retrying all 404s with no content the endpoint we use doesn't
+	// matter.
+	_, err = service.Client().Users().Get(ctx, nil)
+	assert.NoError(t, err, clues.ToCore(err))
+
+	assert.False(t, gock.IsPending(), "some requests not seen")
+}
+
+// ---------------------------------------------------------------------------
+// Integration tests
+// ---------------------------------------------------------------------------
+
 type GraphIntgSuite struct {
 	tester.Suite
 	fakeCredentials account.M365Config

src/pkg/services/m365/api/graph/uploadsession.go

@@ -77,7 +77,8 @@ func (iw *largeItemWriter) Write(p []byte) (int, error) {
 		http.MethodPut,
 		iw.url,
 		bytes.NewReader(p),
-		headers)
+		headers,
+		false)
 	if err != nil {
 		return 0, clues.Wrap(err, "uploading item").With(
 			"upload_id", iw.parentID,

src/pkg/services/m365/m365.go

@@ -55,7 +55,8 @@ func makeAC(
 	cli, err := api.NewClient(
 		creds,
 		control.DefaultOptions(),
-		count.New())
+		count.New(),
+		opts...)
 	if err != nil {
 		return api.Client{}, clues.WrapWC(ctx, err, "constructing api client")
 	}

src/pkg/services/m365/sites_test.go

@@ -76,20 +76,11 @@ func (suite *siteIntegrationSuite) TestSites_GetByID() {
 	ctx, flush := tester.NewContext(t)
 	defer flush()
 
-	sites, err := suite.cli.Sites(ctx, fault.New(true))
+	site, err := suite.cli.SiteByID(ctx, suite.m365.Site.ID)
-	assert.NoError(t, err, clues.ToCore(err))
+	require.NoError(t, err, clues.ToCore(err))
-	assert.NotEmpty(t, sites)
+	assert.NotEmpty(t, site.WebURL)
-
+	assert.NotEmpty(t, site.ID)
-	for _, s := range sites {
+	assert.NotEmpty(t, site.OwnerType)
-		suite.Run("site_"+s.ID, func() {
-			t := suite.T()
-			site, err := suite.cli.SiteByID(ctx, s.ID)
-			require.NoError(t, err, clues.ToCore(err))
-			assert.NotEmpty(t, site.WebURL)
-			assert.NotEmpty(t, site.ID)
-			assert.NotEmpty(t, site.OwnerType)
-		})
-	}
 }
 
 // ---------------------------------------------------------------------------

website/docs/setup/concepts.md

@@ -21,7 +21,8 @@ application to connect to your *M365 tenant* and transfer data during backup and
 ## Corso concepts {#corso-concepts}
 
 * **Repository** refers to the storage location where Corso securely and efficiently stores encrypted *backups* of your
-*M365 Services* data. See [Repositories](../repos) for more information.
+*M365 Service*'s data. See [Repositories](../repos) for more information.
 
-* **Backup** is a copy of your *M365 Services* data to be used for restores in case of deletion, loss, or corruption of the
+* **Backup** is a copy of a resource of your *M365 Service*'s data to be used for restores in case of deletion, loss,
-original data. Corso performs backups incrementally, and each backup only captures data that has changed between backup iterations.
+or corruption of the original data. Corso performs backups incrementally, and each backup only captures data that has
+changed between backup iterations.

website/docusaurus.config.js

@@ -79,12 +79,23 @@ const config = {
           srcDark: 'img/corso_horizontal_logo_white.svg',
         },
         items: [
+          {
+            type: 'doc',
+            docId: 'quickstart',
+            position: 'left',
+            label: 'Quick Start',
+          },
           {
             type: 'doc',
             docId: 'intro',
             position: 'left',
             label: 'Docs',
           },
+          {
+            href: 'https://discord.gg/63DTTSnuhT',
+            label: 'Community',
+            position: 'left',
+          },
           {
             to: '/blog',
             label: 'Blog',
@@ -106,30 +117,12 @@ const config = {
         },
         links: [
           {
-            title: 'Resources',
+            title: 'Open Source',
             items: [
               {
                 label: 'Docs',
                 to: '/docs/intro',
               },
-            ],
-          },
-          {
-            title: 'Community',
-            items: [
-              {
-                label: 'Discord',
-                href: 'https://discord.gg/63DTTSnuhT',
-              },
-              {
-                label: 'Twitter',
-                href: 'https://twitter.com/CorsoBackup',
-              },
-            ],
-          },
-          {
-            title: 'More',
-            items: [
               {
                 label: 'Blog',
                 to: '/blog',
@@ -138,6 +131,26 @@ const config = {
                 label: 'GitHub',
                 href: 'https://github.com/alcionai/corso',
               },
+              {
+                label: 'Corso Discord',
+                href: 'https://discord.gg/63DTTSnuhT',
+              },
+            ],
+          },
+          {
+            title: ' ',
+          },
+          {
+            title: 'Alcion, Powered by Corso',
+            items: [
+              {
+                label: 'Backup as a Service',
+                href: 'https://www.alcion.ai',
+              },
+              {
+                label: 'Alcion Discord',
+                href: 'https://www.alcion.ai/discord',
+              },
             ],
           },
         ],

website/package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@docusaurus/core": "3.1.1",
-    "@docusaurus/plugin-google-gtag": "^3.1.1",
+    "@docusaurus/plugin-google-gtag": "^3.5.1",
     "@docusaurus/preset-classic": "3.1.1",
     "@loadable/component": "^5.16.3",
     "@mdx-js/react": "^3.0.0",
@@ -26,17 +26,17 @@
     "feather-icons": "^4.29.1",
     "jarallax": "^2.2.0",
     "mdx-mermaid": "^2.0.0",
-    "mermaid": "^10.8.0",
+    "mermaid": "^10.9.0",
     "prism-react-renderer": "^2.1.0",
     "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react-dom": "^18.3.0",
-    "sass": "^1.70.0",
+    "sass": "^1.79.1",
     "tiny-slider": "^2.9.4",
     "tw-elements": "1.0.0-alpha13",
     "wow.js": "^1.2.2"
   },
   "devDependencies": {
-    "@docusaurus/module-type-aliases": "3.1.1",
+    "@docusaurus/module-type-aliases": "3.5.1",
     "@iconify/react": "^4.1.1",
     "autoprefixer": "^10.4.17",
     "postcss": "^8.4.33",

website/src/components/parts/CTA.js

@@ -33,7 +33,7 @@ export default function CTA() {
                           <br /> Microsoft 365 Data!
                         </h3>
                         <h6 className="text-white/50 text-lg font-semibold">
-                          Corso is Free and Open Source
+                          Corso (Free and Open Source) or <br/> Alcion (Managed Backup as a Service)
                         </h6>
                       </div>
                     </div>
@@ -41,15 +41,24 @@ export default function CTA() {
                     <div className="mt-8">
                       <div className="section-title text-md-start">
                         <p className="text-white/50 max-w-xl mx-auto mb-2">
-                          Follow our quick-start guide to start protecting your
+                          Whether you want to self-host or use a managed service, we have you covered!
-                          business-critical Microsoft 365 data in just a few
-                          minutes.
                         </p>
+                        <a
+                          href="https://www.alcion.ai/"
+                          className="!text-white !no-underline flex flex-row items-center !hover:text-white"
+                        >
+                          Try Alcion{" "}
+                          <Icon
+                            icon="uim:angle-right-b"
+                            className="align-middle"
+                          />
+                        </a>
+                        <p></p>
                         <a
                           href="docs/quickstart/"
                           className="!text-white !no-underline flex flex-row items-center !hover:text-white"
                         >
-                          Get Started{" "}
+                          Corso Quickstart{" "}
                           <Icon
                             icon="uim:angle-right-b"
                             className="align-middle"

website/src/components/parts/Hero.js

@@ -34,10 +34,17 @@ export default function Hero() {
 
           <div className="mt-12 !z-10 mb-6 flex flex-col 2xs:flex-row items-center justify-center 2xs:space-y-0 space-y-4 2xs:space-x-4">
             <a
-              href="../docs/quickstart/"
+              href="https://github.com/alcionai/corso/releases" target="_blank"
               className="text-2xl !z-10 !no-underline hover:text-white py-2 px-6 font-bold btn bg-indigo-800 hover:bg-indigo-900 border-indigo-800 hover:border-indigo-900 text-white rounded-md"
             >
-              Quick Start
+              Download
+            </a>
+
+            <a
+              href="https://www.alcion.ai/"
+              className="text-2xl !z-10 !no-underline hover:text-white py-2 px-6 font-bold btn bg-indigo-200 hover:bg-indigo-400 border-indigo-600 hover:border-indigo-800 text-blue rounded-md"
+            >
+              Try Alcion (Corso SaaS)
             </a>
           </div>
 

website/src/components/parts/KeyLoveFAQ.js

@@ -213,9 +213,9 @@ export default function KeyLoveFAQ() {
               Community
             </h3>
             <p className="text-slate-400">
-              The Corso community provides a venue for M365 admins to share and
+              The Corso community provides a venue for Microsoft 365 admins to share and
               learn about the importance of data protection as well as best
-              practices around M365 secure configuration and compliance
+              practices around Microsoft 365 secure configuration and compliance
               management.
             </p>
             <ul className="list-none text-slate-400 mt-4">
@@ -279,8 +279,7 @@ export default function KeyLoveFAQ() {
             </h3>
             <p className="text-slate-400">
               Corso provides secure data backup that protects customers against
-              accidental data loss, service provider downtime, and malicious
+              accidental data loss and service provider downtime.
-              threats including ransomware attacks.
             </p>
             <ul className="list-none text-slate-400 mt-4">
               <li className="mb-1 flex">
@@ -331,7 +330,7 @@ export default function KeyLoveFAQ() {
               Robust Backups
             </h3>
             <p className="text-slate-400">
-              Corso, purpose-built for M365 protection, provides easy-to-use
+              Corso, purpose-built for Microsoft 365 protection, provides easy-to-use
               comprehensive backup and restore workflows that reduces backup
               time, improve time-to-recovery, reduce admin overhead, and replace
               unreliable scripts or workarounds.
@@ -342,7 +341,7 @@ export default function KeyLoveFAQ() {
                   className="text-indigo-600 text-xl mr-2"
                   icon="material-symbols:check-circle-outline"
                 />{" "}
-                Constantly updated M365 Graph Data engine
+                Constantly updated Microsoft 365 Graph Data engine
               </li>
               <li className="mb-1 flex">
                 <Icon
@@ -462,7 +461,7 @@ export default function KeyLoveFAQ() {
 
           <div className="md:col-span-6">
             <div className="accordion space-y-3" id="accordionExample">
-              <div className="accordion-item !text-white relative  shadow dark:shadow-gray-800 rounded-md overflow-hidden">
+            <div className="accordion-item !text-white relative  shadow dark:shadow-gray-800 rounded-md overflow-hidden">
                 <h2
                   className="accordion-header mb-0 !cursor-pointer font-semibold"
                   id="headingOne"
@@ -475,7 +474,7 @@ export default function KeyLoveFAQ() {
                     aria-expanded="false"
                     aria-controls="collapseOne"
                   >
-                    <span>What platforms does Corso run on?</span>
+                    <span>How do I choose between Corso and Alcion, powered by Corso?</span>
                   </button>
                 </h2>
                 <div
@@ -486,8 +485,7 @@ export default function KeyLoveFAQ() {
                 >
                   <div className="accordion-body p-5">
                     <p className="text-slate-400 !visible dark:text-gray-400">
-                      Corso has both native binaries and container images for
+                      Corso is a good fit for basic backup while Alcion is a better fit if you need increased reliability, security, and support.
-                      Windows, Linux, and macOS.
                     </p>
                   </div>
                 </div>
@@ -505,9 +503,7 @@ export default function KeyLoveFAQ() {
                     aria-expanded="false"
                     aria-controls="collapse2"
                   >
-                    <span>
+                    <span>What platforms does Corso run on?</span>
-                      What Microsoft 365 services can I backup using Corso?
-                    </span>
                   </button>
                 </h2>
                 <div
@@ -518,8 +514,8 @@ export default function KeyLoveFAQ() {
                 >
                   <div className="accordion-body p-5">
                     <p className="text-slate-400 !visible dark:text-gray-400">
-                      Corso currently supports OneDrive, Exchange, SharePoint,
+                      Corso has both native binaries and container images for
-                      and Teams. 
+                      Windows, Linux, and macOS.
                     </p>
                   </div>
                 </div>
@@ -537,7 +533,9 @@ export default function KeyLoveFAQ() {
                     aria-expanded="false"
                     aria-controls="collapse3"
                   >
-                    <span>What object storage does Corso support?</span>
+                    <span>
+                      What Microsoft 365 services can I backup using Corso?
+                    </span>
                   </button>
                 </h2>
                 <div
@@ -545,6 +543,36 @@ export default function KeyLoveFAQ() {
                   className="accordion-collapse collapse"
                   aria-labelledby="heading3"
                   data-bs-parent="#accordionExample"
+                >
+                  <div className="accordion-body p-5">
+                    <p className="text-slate-400 !visible dark:text-gray-400">
+                      Corso currently supports OneDrive, Exchange, SharePoint,
+                      and Teams.
+                    </p>
+                  </div>
+                </div>
+              </div>
+              <div className="accordion-item !text-white relative  shadow dark:shadow-gray-800 rounded-md overflow-hidden">
+                <h2
+                  className="accordion-header mb-0 !cursor-pointer font-semibold"
+                  id="heading4"
+                >
+                  <button
+                    className="transition accordion-button-custom text-white !text-base !cursor-pointer border-none outline-none collapsed focus:outline-none !bg-transparent flex justify-between items-center p-5 w-full font-bold text-left"
+                    type="button"
+                    data-bs-toggle="collapse"
+                    data-bs-target="#collapse4"
+                    aria-expanded="false"
+                    aria-controls="collapse4"
+                  >
+                    <span>What object storage does Corso support?</span>
+                  </button>
+                </h2>
+                <div
+                  id="collapse4"
+                  className="accordion-collapse collapse"
+                  aria-labelledby="heading4"
+                  data-bs-parent="#accordionExample"
                 >
                   <div className="accordion-body p-5">
                     <p className="text-slate-400 dark:text-gray-400 !visible">
@@ -559,23 +587,23 @@ export default function KeyLoveFAQ() {
               <div className="accordion-item !text-white relative shadow dark:shadow-gray-800 rounded-md overflow-hidden">
                 <h2
                   className="accordion-header mb-0 font-semibold"
-                  id="heading4"
+                  id="heading5"
                 >
                   <button
                     className="transition accordion-button-custom text-white !text-base !cursor-pointer border-none outline-none collapsed focus:outline-none !bg-transparent flex justify-between items-center p-5 w-full font-bold text-left"
                     type="button"
                     data-bs-toggle="collapse"
-                    data-bs-target="#collapse4"
+                    data-bs-target="#collapse5"
                     aria-expanded="false"
-                    aria-controls="collapse4"
+                    aria-controls="collapse5"
                   >
                     <span>How can I get help for Corso?</span>
                   </button>
                 </h2>
                 <div
-                  id="collapse4"
+                  id="collapse5"
                   className="accordion-collapse collapse"
-                  aria-labelledby="heading4"
+                  aria-labelledby="heading5"
                   data-bs-parent="#accordionExample"
                 >
                   <div className="accordion-body p-5">
@@ -605,23 +633,23 @@ export default function KeyLoveFAQ() {
               <div className="accordion-item !text-white relative  shadow dark:shadow-gray-800 rounded-md overflow-hidden">
                 <h2
                   className="accordion-header mb-0 !cursor-pointer font-semibold"
-                  id="heading5"
+                  id="heading6"
                 >
                   <button
                     className="transition accordion-button-custom text-white !text-base !cursor-pointer border-none outline-none collapsed focus:outline-none !bg-transparent flex justify-between items-center p-5 w-full font-bold text-left"
                     type="button"
                     data-bs-toggle="collapse"
-                    data-bs-target="#collapse5"
+                    data-bs-target="#collapse6"
                     aria-expanded="false"
-                    aria-controls="collapse5"
+                    aria-controls="collapse6"
                   >
                     <span>What is Corso's open-source license?</span>
                   </button>
                 </h2>
                 <div
-                  id="collapse5"
+                  id="collapse6"
                   className="accordion-collapse collapse"
-                  aria-labelledby="heading5"
+                  aria-labelledby="heading6"
                   data-bs-parent="#accordionExample"
                 >
                   <div className="accordion-body p-5">
@@ -635,23 +663,23 @@ export default function KeyLoveFAQ() {
               <div className="accordion-item !text-white relative  shadow dark:shadow-gray-800 rounded-md overflow-hidden">
                 <h2
                   className="accordion-header mb-0 !cursor-pointer font-semibold"
-                  id="heading6"
+                  id="heading7"
                 >
                   <button
                     className="transition accordion-button-custom text-white !text-base !cursor-pointer border-none outline-none collapsed focus:outline-none !bg-transparent flex justify-between items-center p-5 w-full font-bold text-left"
                     type="button"
                     data-bs-toggle="collapse"
-                    data-bs-target="#collapse6"
+                    data-bs-target="#collapse7"
                     aria-expanded="false"
-                    aria-controls="collapse6"
+                    aria-controls="collapse7"
                   >
                     <span>How do I request a new feature?</span>
                   </button>
                 </h2>
                 <div
-                  id="collapse6"
+                  id="collapse7"
                   className="accordion-collapse collapse"
-                  aria-labelledby="heading6"
+                  aria-labelledby="heading7"
                   data-bs-parent="#accordionExample"
                 >
                   <div className="accordion-body p-5">

website/static/img/corso_horizontal_logo_white.svg

@@ -1 +1,95 @@
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