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Lazily fetch Exchange item data when possible (#4300 )

Implement lazy data fetch for Exchange items.
Use a new collection type to clearly denote
when items can be lazily fetched vs. requiring
eager fetch

**This PR changes how the read bytes stat is
updated.** Lazily fetched items will not
update the read bytes stat. This stat doesn't
appear to be used anywhere at the moment

For items that are deleted between the time
enumeration takes place and the time the data
for them needs fetched, the corso will:
* return an empty reader for the item
* not add the item to backup details
* delete the (empty) item from kopia on the
  next backup

Manually tested deleting an item between
enumeration and data fetch

---

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

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

#### Type of change

- [x] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

* closes #2023

#### Test Plan

- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E

2023-09-20 20:12:05 +00:00

.github

Switch to long-lived AWS credentials (#4296 )

2023-09-19 18:48:56 +00:00

build

bump golang to v1.21 (#4170 )

2023-08-31 17:26:19 +00:00

design

remove design/cli.md; conflicts with docs (#2097 )

2023-01-11 06:28:10 +00:00

docker

[Snyk] Security upgrade ubuntu from latest to 22.10 (#3159 )

2023-04-21 04:32:57 +00:00

src

Lazily fetch Exchange item data when possible (#4300 )

2023-09-20 20:12:05 +00:00

website

Add a minor fix for make buildimage (#4295 )

2023-09-19 20:39:15 +00:00

.dockerignore

introduce docker container production (#660 )

2022-09-01 15:06:57 +00:00

.gitattributes

Add vector images for "Why Everyone Loves Corso" (#781 )

2022-09-06 22:15:15 +00:00

.gitignore

updating gitignore to catch log files (#3549 )

2023-06-01 06:06:44 +00:00

CHANGELOG.md

Lazily fetch Exchange item data when possible (#4300 )

2023-09-20 20:12:05 +00:00

CODE_OF_CONDUCT.md

Update README and upgrade COC (#1068 )

2022-10-06 11:10:12 +00:00

LICENSE

Remove some license boilerplate (#1071 )

2022-10-06 16:43:52 +00:00

README.md

Move Corso to beta (#2566 )

2023-02-18 15:35:59 +00:00

SECURITY.md

Create a security policy (#1879 )

2022-12-20 19:58:11 +00:00

README.md

Corso Logo

Corso

Corso is the first open-source tool that aims to assist IT admins with the critical task of protecting their Microsoft 365 data. It provides a reliable, secure, and efficient data protection engine. Admins decide where to store the backup data and have the flexibility to perform backups of their desired service through an intuitive interface. As Corso evolves, it can become a great building block for more complex data protection workflows.

Corso is currently in Beta.

Corso supports M365 Exchange and OneDrive with SharePoint and Teams support in active development. Coverage for more services, possibly beyond M365, will expand based on the interest and needs of the community.

Getting Started

See the Corso Quickstart on our docs page.

Building Corso

To learn more about working with the project source core and building Corso, see the Developer section of the Corso Documentation.

Roadmap

You can learn more about the Corso roadmap and how to interpret it here.

If you have feature requests, please file a GitHub issue and attach the enhancement label to the issue.

Contribution Guidelines

Code of Conduct

It's important that our community is inclusive and respectful of everyone. We ask that all Corso users and contributors take a few minutes to review our Code of Conduct.

License

Corso is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.