Error message when you use the Exchange Management Console to try to reconnect a mailbox to a user account: "The specified mailbox is not unique on database"

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SYMPTOMS

You have two or more disconnected Microsoft Exchange Server 2007 mailboxes that have the same legacyExchangeDN in a database. When you use the Exchange Management Console to try to reconnect one of mailboxes to a user account, the connection fails. Additionally, you may receive the following error message:

The specified mailbox "<mailbox GUID>" is not unique on database "<server name>\<storage group>\<mailbox store>".
Exchange Management Shell command attempted:

Connect-Mailbox -Identity '<mailbox GUID>' -Database '<server name>\<storage group>\<mailbox store>' -User '<>domain\<user>' -Alias '<alias>'
Elapsed Time: 00:00:00

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RESOLUTION

To resolve this problem, install Update Rollup 4 for Exchange Server 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

940006 (http://support.microsoft.com/kb/940006/ ) Description of Update Rollup 4 for Exchange Server 2007

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 (http://support.microsoft.com/kb/824684/LN/ ) Description of the standard terminology that is used to describe Microsoft software updates

For more information about the naming schema for Exchange Server software updates, click the following article number to view the article in the Microsoft Knowledge Base:

817903 (http://support.microsoft.com/kb/817903/ ) New naming schema for Exchange Server software update packages

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