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How to Migrate a Single IMAP Mailbox to Exchange Online
Question details
A user needs to migrate one specific email account from an existing IMAP service to Exchange Online, planning to migrate the remaining accounts at a later date.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Performing a phased email migration to Microsoft 365 for a small business environment.
- Observed behavior
- The business wants to ensure that migrating a single mailbox operates independently and does not disrupt the email service for the other active IMAP accounts.
Ensure you have global administrator access to the Microsoft 365 admin center and the exact IMAP server details and account credentials for the single mailbox you intend to migrate.
Use the Microsoft 365 Admin Center IMAP Migration Tool
You can perform a phased migration by manually selecting and moving only the specific IMAP mailbox you need.
Exchange Online supports phased migrations natively. By creating a targeted migration batch using a CSV file, you can move mailboxes one at a time. The rest of your IMAP accounts will remain completely active on your old provider without any downtime.
Sign in to the Microsoft 365 admin center as a global administrator, navigate to the 'Admin centers' menu on the left, and click on 'Exchange'.
In the Exchange admin center, click on 'Migration' under the 'Mailbox' or 'Data migration' section.
Click 'Add migration batch', select 'Migrate to Exchange Online', and choose 'IMAP migration'. Upload a CSV file that contains only the email address, username, and password of the single mailbox you wish to migrate.
Enter your existing IMAP server details (such as server address and port) to create the migration endpoint, then click 'Next'.
Review your batch settings and click 'Save' or 'Start' to begin syncing the mailbox data to Exchange Online.
Request Direct Assistance from Microsoft Support
If you need help setting up the IMAP endpoint or batch, you can request direct support from Microsoft instead of using a paid third-party partner.
Enhance Your Productivity After Email Migration with WPS Office
While you migrate your email infrastructure to Exchange Online, you do not have to commit to expensive desktop application subscriptions. WPS Office provides a free, lightweight, and highly intuitive alternative that fulfills all your document creation needs while perfectly handling Microsoft Office file formats.
- 1. Download the installer: Visit the official WPS Office website and download the free software suite tailored for your operating system.
- 2. Install the application: Run the downloaded installer file and follow the brief on-screen instructions to set up the software.
- 3. Open your files instantly: Double-click any existing Microsoft Office documents on your computer to open, edit, and save them directly in WPS Office.
Frequently Asked Questions
Can I migrate my business emails to Microsoft 365 in phases?
Yes, Microsoft 365 fully supports phased IMAP migrations. You can selectively migrate one or multiple mailboxes first by creating a migration batch that only includes those specific users, leaving the remaining users on your previous server.
Will migrating one IMAP account disrupt my other email accounts?
No. Provided you only include the specific email address in your migration batch CSV file, your other accounts will remain completely unaffected and will continue to send and receive emails on your existing provider.
Do I need to hire a Microsoft Partner for a simple email migration?
No, you are not required to use a partner. Global administrators can manage the IMAP migration themselves via the Exchange admin center, or they can request direct support from Microsoft by opening a help ticket at admin.microsoft.com.
What credentials are required to migrate an IMAP mailbox?
To perform an IMAP migration, you must have the IMAP server address (e.g., imap.yourdomain.com), the server port number, the specific email address, and the current password or an app-specific password for the account being migrated.
