When users attempt to log on to their mailboxes during a Move Mailbox operation on the server, you may see the following entry in the application log:
Event ID: 1022
Type: Error
Source: MSExchangeIS Mailbox
Description:
Logon Failure on database "[storage_group_name]\[mailbox_store_name]" - Windows
NT account [domain_name]\[user_name]; mailbox
/o=[organization_name]/ou=[site_name]/cn=[recipient_container_name]/cn=[user_name].
Error: -2147221231
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You may see the following error codes in the description: ecLoginFailure, ecMailboxInTransit, or ecWrongServer.
This Event ID may be repeated many times. The application event log may fill up with these events if users who are being moved are trying to log on.