Is Outlook 2000 configured to connect to an Exchange server via the
Microsoft Exchange transport? The reason that I ask is that Outlook 98/2000
can be installed in Internet Mail Only or Corporate/Workgroup mode.
Corp/Workgroup mode is required in order to connect to a Microsoft Exchange
server via the exchange transport.
Also, what version of Exchange? The reason that I ask is that with Exchange
5.5, it offers up the Global Address List. Under Exchange 2000/2003,
Outlook will connect to a domain controller that is a global catalog. Will
need to verify that Outlook 2000 is connecting to a global catalog server
that is in good health.