This issue occurs because Active Directory global catalog server is not
available to perform LDAP queries.
Check for any MSExchangeDSAccess errors in the application log of the event
Also, you might want to run dcdiag and netdiag (Windows 2000 Support Tools)
to determine if you have any networking or AD issues. hen running DCDiag,
you'll want to use a /s:<DC name> if Exchange is a member server)
Microsoft Exchange Support
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