Hi @Mirka IPH
Thank you for posting your question in the Microsoft Q&A forum.
Based on the information you have provided, looks like you have trouble when creating a migration endpoint.
If you are using IMAP to migrate from MDaemon
- Please ensure that IMAP is enabled on the MDaemon server. Verify that all mailboxes are accessible via IMAP.
- Microsoft 365 no longer supports Basic Authentication for IMAP as of late 2022. If MDaemon only supports Basic Auth, you'll need to enable OAuth 2.0 on MDaemon.
- Microsoft 365 requires TLS 1.2 or higher. Ensure your MDaemon server supports and uses this version.
You can also check out these links for more details:
Creation of migration endpoints using different methods | Microsoft Learn
Migrate other types of IMAP mailboxes to Microsoft 365 or Office 365 | Microsoft Learn
New-MigrationEndpoint (ExchangePowerShell) | Microsoft Learn
(If you'd like to create Migration Endpoint with PowerShell)
I hope this information helps.
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