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This is a huge update (numeric-wise) and a one thing that many of us didnβt see coming.
- Hereafter, you can have up to 1000 private channels per team (previously limited to 30)
- Each private channel can now have 5000 members (previously 250)
- You can finally schedule meetings directly in private channels
- Compliance shifts from user mailboxes β team group mailboxes
Migration starts late September 2025 and will finish by mid-December 2025.
After migration, private channel data will move from user mailboxes to the teamβs group mailbox.
- βοΈ Retention, DLP, legal hold, and eDiscovery policies must be applied at the group level
- βοΈ During migration, check both user mailboxes + group mailboxes for full coverage
- βοΈ If you donβt update policies, new private channel data wonβt be protected
Microsoft will also release a new PowerShell cmdlet to help admins track when their tenantβs migration has started or completed.