In 2026, moving an IMAP mailbox to Microsoft 365 has become much easier, but the overall experience depends on the method you choose. If you're migrating a single mailbox, the manual method may be enough. For multiple mailboxes or business accounts, an automated approach usually saves time and requires less effort.
Method 1: Manual IMAP Migration
If you want to use Microsoft's built-in migration process, follow these steps:
Sign in to the Microsoft 365 Admin Center.
Create the destination mailboxes if they don't already exist.
Enable IMAP access on the source email account.
Open the Exchange Admin Center and create a new IMAP migration batch.
Enter the IMAP server details and mailbox credentials.
Start the migration.
After it finishes, verify the emails, folders, and attachments.
Limitations of the Manual IMAP to Microsoft 365 Migration Method:
It takes a lot of time when you have multiple mailboxes to migrate.
A small configuration mistake can force you to restart the migration from the beginning.
Finding and fixing migration errors can be difficult for non-technical users.
After the migration, you still need to check that all emails, folders, and attachments have been transferred correctly.
Method 2: Automated IMAP to Microsoft 365 Migration
When I had to move multiple IMAP mailboxes to Microsoft 365, I chose WholeClear IMAP to Office 365 Converter because I wanted a simpler way to migrate several accounts without spending time configuring migration batches.
The process was straightforward:
Launch the application.
Enter the IMAP account credentials.
Sign in with the Microsoft 365 account.
Select the mailbox you want to migrate.
Start the migration process.
Once it finishes, verify the mailbox folders, email count, and attachments.
What I liked was that I didn't have to export mailbox files or migrate every account separately. The emails, attachments, folder hierarchy, and other mailbox details remained intact after the migration, which made the move to Microsoft 365 much easier to manage.
