Microsoft KB Archive/940052

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

Article ID: 940052

Article Last Modified on 8/27/2007

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APPLIES TO


 * Microsoft Exchange Server 2007 Enterprise Edition
 * Microsoft Exchange Server 2007 Standard Edition

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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 &quot;&quot; is not unique on database &quot; \ \ &quot;.

Exchange Management Shell command attempted:

Connect-Mailbox -Identity '' -Database ' \ \ ' -User '<>domain\ ' -Alias ' '

Elapsed Time: 00:00:00



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

940006 Description of Update Rollup 4 for Exchange 2007



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



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

824684 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 New naming schema for Exchange Server software update packages

Keywords: kbqfe kbexchstore kbexpertiseinter KB940052

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