This article was previously published under Q246741
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When you export directory objects through the Exchange Server Administrator program by clicking Directory Export on the Tools menu, you may receive the following information in the .csv file:
?\UNKNOWN Primary Windows NT Accounts
However, the Administrator program displays the Microsoft Windows NT user account when you view the mailbox properties.
This behavior may occur when the Exchange Server service account, the Administrator account, and the Windows NT user accounts associated to the mailboxes are in different Windows NT domains that are not two-way trusted domains, as in the following scenario:
Domain1 contains the Exchange Server and service account Domain2 contains the Exchange Administrator account Domain3 contains the User accounts
Domain1 trusts Domain2 and Domain3 Domain3 trusts Domain2 Domain2 trusts no domain
To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack
Microsoft has confirmed that this is a problem in Microsoft Exchange Server 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.