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SYMPTOMS
In larger Microsoft Exchange Server 2003 organizations and larger Microsoft Exchange 2000 Server organizations, some operations do not work correctly if NetBIOS name resolution is not working on the network.
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CAUSE
Exchange 2003 and Exchange 2000 still have several NetBIOS dependencies. You may have to use NetBIOS name resolution across different subnets for the successful operation of all Exchange components, depending on the network topology.
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RESOLUTION
Microsoft recommends that Exchange organizations use Windows Internet Name Service (WINS) and DNS for name resolution. Installations of Exchange 2003 and Exchange 2000 in large and subnetted organizations without WINS have not been fully tested. In large organizations, NetBIOS name resolution through broadcasts may not function correctly. Some Exchange functionality may also be affected.