I’m not an Exchange expert but I do know that in order to work properly the Exchange server needs a Global Catalog (GC) for name checking, etc. There seems to be an issue when you upgrade this GC to Windows Server 2003:After you upgrade the global catalog to Windows Server 2003, you receive an error message when you use Outlook 2000 or an earlier version to resolve aliases or to connect to a server that is running Exchange Server (KB903295)

SYMPTOMS:You upgr