Hi,
I'm migrating some users from one Exchange 2013 SP1 CU6 database to another one. Some users fail with warnings:
Error:MigrationPermanentException: Warning: Target mailbox unlock operation was not replicated. If a lossy failover occurs after the target mailbox was unlocked, the target mailbox could remain inaccessible. Error details: Mailbox changes failed to replicate. Database doesn't satisfy the constraint SecondCopy because the commit time 7/12/2014 4:22:54 PM isn't guaranteed by replication time 7/12/2014 4:14:25 PM.
Part of the problem is likely that on the passive DAG member, the Microsoft Exchange Migration Workflow service keeps crashing and restarting.
I migrated probably 300 users no problem prior to CU6 (we were on CU4/SP1), this issue now happens on 1/10 migrated users. As far as I've seen, this causes the users no issues what so ever, however I haven't had a fail over to the passive DAG member since these migrations.
Simply re-running the migration jobs don't help. Thinking of CU7 but can't see anything in the release notes mentioning this at all.