Microsoft announced a public preview for cross tenant user data migration on December 16, 2025. Mailboxes, OneDrive files and Teams chats move between Microsoft 365 tenants. Admins choose which services to move and migrate batches of up to 2,000 users. Teams channels, team files and tenant settings do not appear on the Microsoft lists. No general availability date is given.
Companies merge and teams need their Microsoft Teams data in another tenant. Microsoft now documents one orchestrated route for user data. It is a preview and its scope is narrower than the phrase migrate Teams suggests.
Facts follow the Microsoft Tech Community post Public Preview of cross tenant orchestrated user data migration and the Microsoft Learn page Microsoft 365 migration.
What does Microsoft Migrate Between Tenants?
- Exchange mailboxes.
- OneDrive files.
- Teams chats. One to one chats, group chats and meeting chats.
- Meetings. Microsoft cancels and reschedules them for the user automatically.
Admins choose which services to move. Identity mapping is one to one between source and destination users.
What are the Limits and the Status?
- Status. Public preview started on December 16, 2025. Microsoft gives no end date and no final release date.
- Batch size. Up to 2,000 users per batch.
- Impact timing. Admins set when users feel the impact. Until then only backend sync is active.
- Licensing. EA, CSP, web direct, small business and EDU customers can join the preview. Pricing at general availability is not available yet.
What About Teams Channels and Files?
Teams chats appear in the post and channels do not. Microsoft Learn names mailboxes, OneDrive and SharePoint sites in its tenant to tenant section. Teams does not appear there.
Slack to Teams is the only Teams migration on the Learn page. It moves Slack channels, messages and files into Teams and does not move data between tenants.
How to Start the Migration?
Join the public preview. Then follow the Migration orchestrator overview on Microsoft Learn. Admin center steps and unsupported scenarios do not appear in the Tech Community post.
What does Microsoft Not Say?
- Whether Teams channels, team files and tabs move.
- Which workloads the Migration orchestrator includes beyond the preview list.
- End of the preview or a final release date.
- Any step for copying a channel from one team to another inside one tenant.
Related reading: how to move files between OneDrive for Business accounts and how to restore an Office 365 mailbox from backup.
Frequently Asked Questions
Can I Migrate Microsoft Teams Data Between Tenants?
Partly. Microsoft documents a public preview that moves mailboxes, OneDrive files and Teams chats. Channels do not appear in the post.
Which Teams Data does Microsoft Migrate?
Microsoft lists one to one chats, group chats and meeting chats.
How Many Users can I Migrate in One Batch?
Microsoft states up to 2,000 users per batch.
Is the Migration Generally Available?
Microsoft does not say. Its post announces a public preview on December 16, 2025 and gives no release date for general use.
Does Microsoft Move Teams Channel Files?
Microsoft does not say. Channel files do not appear on its lists.
Key Takeaways
- Cross tenant user data migration started as a public preview on December 16, 2025.
- Mailboxes, OneDrive files and Teams chats are the listed workloads.
- Teams channels and team files are not listed.
- Batches of up to 2,000 users use one to one identity mapping.
- No release date for general use is given.
Sources and References
Facts follow Microsoft sources.
- Public preview of cross tenant orchestrated user data migration (Microsoft Tech Community) techcommunity.microsoft.com
- Microsoft 365 migration (Microsoft Learn) learn.microsoft.com