Consider the following scenario:

•	You install Microsoft Exchange Server 2007 in the root domain of a forest.
•	You create an alternative domain tree in the forest that has a completely non-contiguous namespace, and then you prepare it for Exchange.
•	You create mailboxes for the users of the alternative domain tree on the Exchange server.
•	In the Exchange Management Console, you start the Message Tracking tool, and then you try to resolve a sender name or a recipient name that belongs to the alternative domain tree.

In this scenario, no user is resolved, and nothing is returned.

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This problem occurs because the corresponding directory lookup function makes assumptions that are based only on the root domain. Therefore, the directory lookup function misses the alternative domain tree that has a non-contiguous namespace.

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Update information

Download and install Update Rollup 3 for Exchange 2007 SP1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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

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For more information about forests and non-contiguous namespaces, visit the following Microsoft Web site:

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