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How to Resolve Investigated IMAP Migration Status in Exchange Online
Question details
The user needs to resolve an Investigated status that pauses an IMAP email migration to Microsoft 365 due to skipped items.
- Product
- Microsoft 365 / Exchange Online
- Device & OS
- not provided
- Scenario
- Migrating mailboxes from Zimbra to Microsoft 365 via IMAP when the migration halts with skipped messages.
- Observed behavior
- Mailboxes display an Investigated status, items are missing or skipped, and the migration interface lacks an Accept option to continue the batch.
Ensure you are logged in with a Microsoft 365 Global Administrator account, as standard users do not have the permissions required to access migration logs or open backend service requests.
Contact Microsoft Support via the Microsoft 365 Admin Center
Because the Investigated status requires backend log inspection to determine why items were skipped, a Global Administrator must open a service request to resume the batch.
When an IMAP migration batch encounters too many corrupted or missing items, Exchange Online halts the process and flags it as Investigated. If the Accept button is missing from your Exchange admin center interface, only Microsoft backend support can bypass this block.
Navigate to the Microsoft 365 admin center (admin.microsoft.com) and sign in using your Global Administrator credentials.
Click on the 'Help & support' headset icon located at the bottom right corner of the admin center dashboard.
Type 'Investigated IMAP migration status' in the search bar, review the automated diagnostics, and select the option to contact a support agent.
In your ticket, specify that you are migrating from Zimbra, list the affected mailboxes, and explicitly state that the 'Accept' option is missing from the migration interface.
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Frequently Asked Questions
Why does my IMAP migration batch say 'Investigated'?
This status occurs when the migration process encounters corrupted items, missing data, or connection drops from the source server (like Zimbra) that exceed the allowed skipped item limit.
Can I force the migration batch to continue without Microsoft support?
In some cases, you might see an 'Accept' button in the Exchange admin center interface to approve skipped items. However, if this button is missing, you must contact Microsoft Support to inspect the backend logs and manually resume the batch.
What information should I give Microsoft Support for this issue?
Provide your tenant ID, the exact name of the migration batch, the source email system (e.g., Zimbra), the number of affected mailboxes, and specify that items are being skipped with an 'Investigated' status.
