ODME : How to Verify Whether a Mail Migration Is Stuck (4384161)

A customer reported that the Final Sync phase of a mailbox migration in On Demand Migration was taking longer than expected. They wanted to determine whether the migration was still progressing or had become stuck and requested guidance on how to verify the migration status.

The Final Sync phase may remain in progress for an extended period and does not necessarily indicate that the migration is stuck. The duration of the final synchronization depends on several factors, including mailbox size, ongoing mailbox activity, Microsoft Exchange Online throttling, transient service conditions, and the amount of remaining data to synchronize.

To determine whether the mailbox migration is still progressing or has become stuck during the Final Sync phase, perform the following checks::-

1. Request customer for the diagnostics information
2. Verify that the migration task status remains Final Sync and has not transitioned to a failed state.
3. Review the migration logs to confirm that new log entries are still being generated.
4. Check for Microsoft Exchange Online throttling or transient errors in the migration logs.
5. Allow sufficient time for the final synchronization to complete, especially for large or frequently updated mailboxes.
6. If there is no progress, no new log activity, and the migration remains in the Final Sync state for an extended period, collect the migration logs and contact Quest Support for further investigation.

Note: A mailbox migration is generally not considered stuck if the migration logs continue to update or the migrated item count continues to increase, even if the status remains Final Sync.