Event ID - 9660

Event Id9660
DescriptionUser Username (FQDN of Username) failed to log on because their mailbox is in the process of being moved. For more information, click http://www.microsoft.com/contentredirect.asp.
Event InformationAccording to Microsoft:
Other issues that you may experience during the move mailbox process may include the following:
1. Size limits on the destination server, including mailbox size limits, can prevent successful mailbox moves. Exchange Server 2003 Standard Edition includes a 16-gigabyte limit.
2. A mailbox must be associated with a valid account. If the account that is associated with a mailbox is disabled, the associated external account must reference SELF in the Active Directory directory service or in a resource account.
3. View the Admindmp.txt file to troubleshoot issues that occur during or after a mailbox has been moved.
Try comparing the mailbox attributes on the problem mailboxes with mailboxes that are known to be good to determine whether a configuration difference is causing the move issues.
Reference LinksMoving mailboxes in Exchange Server 2003

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