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How to Complete or Delete an IMAP Migration Batch at 100 Percent in Microsoft 365
Question details
The administrator needs to know if an IMAP migration batch can be safely deleted when it reports 100% synchronization but lacks the option to complete the batch, specifically after changing MX records and noting skipped messages.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Finalizing an email migration after domain MX records have been pointed to Microsoft 365.
- Observed behavior
- The IMAP migration batch shows 100 percent synchronization with some skipped messages, but the UI does not offer the option to complete the batch.
Ensure you have reviewed the skipped items report to confirm no critical emails were left behind before proceeding with the batch deletion.
Safely Delete the Migration Batch After MX Record Verification
If the completion option is unavailable, you can safely delete the migration batch once mail flow to Microsoft 365 is fully verified.
In some Exchange Online scenarios, an IMAP migration batch may reach 100% synchronization but fail to display the 'Complete' button. Deleting the batch is a safe administrative action provided that your MX records have been successfully updated and incoming mail is properly routing to the new environment.
Check the migration report details to confirm that the skipped messages are acceptable and that the migrated mail volume is sufficient for your users.
Access your DNS hosting provider's dashboard and verify that your domain's MX records are pointing to Microsoft 365.
Send test emails from external accounts to ensure that new incoming mail is successfully routing to the Exchange Online mailboxes.
Navigate to the Exchange admin center, select Migration, choose the stuck migration batch, and click the Delete (trash can) icon to remove it.
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Frequently Asked Questions
Why is my IMAP migration batch stuck at 100% without a complete option?
This typically occurs if the migration process encounters minor synchronization glitches or skipped items. Once all required emails are synced, the system may simply hold the status, requiring you to manually delete the batch after verifying mail flow.
Will I lose my migrated emails if I delete the migration batch?
No. Deleting a migration batch only removes the synchronization relationship and the status record from the Exchange admin center. Emails that have already been synced to Microsoft 365 will remain safely in the target mailboxes.
When is the right time to change MX records during an IMAP migration?
You should change your MX records to point to Microsoft 365 after the initial synchronization reaches 100% and you have verified that the migrated data is accurate. This ensures all new emails are delivered directly to the new environment.
