Maintaining the original folder structure is important when migrating an IMAP mailbox to Office 365. Many users organize their emails into folders according to clients, projects, departments, or years.
Microsoft 365's IMAP migration supports transferring email folders, but administrators should verify how the source provider's folder hierarchy and special folders are handled.
Before starting, review the source mailbox and identify important folders. Check whether folders are nested and whether special folders such as Sent, Drafts, and Trash require additional attention.
You should also confirm that the destination mailbox has enough storage and that the migration process is not skipping specific folders.
If you are exploring third-party alternatives,
MacSonik IMAP to Office 365 is worth evaluating for its folder migration capabilities.
Run a test with a mailbox containing multiple nested folders. After migration, compare the original and destination folder structures and check whether the messages appear in the correct locations.
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