- Event 1006
Source: MSExchange Mailbox Replication
The Mailbox Replication service was unable to process mailbox move requests in a mailbox database.
Database: <your database name>
Error: MapiExceptionUnknownUser: Unable to open message store. (hr=0x80004005, ec=1003)
This will show which mailboxes have Completed, are still In Progress or Queued
You might see an invalid move request for the old database which you can remove by using the following make sure you don't have any valid Move requests in progress before executing the following :
- Get-MoveRequest | Remove-MoveRequest
What you should do is restart the MSExchangeMailboxReplication service on any CAS machine where this event is being encountered. This error occurs because the MailboxReplicationService (MRS) currently caches Mailbox Database information past the lifetime of some databases. Restarting the service will clear the cache. Restarting the service should be a safe operation, and there will be no loss of service if there are no active/pending MoveRequests.