Exchange 5.5. and Outlook 2001 for Mac

What all has to be setup for Outlook2001 for Mac on the
exchange server? Have services for mac, file server,
print server, etc..
Mac can see Mac volume but won't connect to exchange
server. Had no problem first time connecting a G4 this
way but a new mac with OS X won't see it. Also the old
G4 won't either. Would prefer to use TCP/IP over apple
talk...have looked up a bunch of support articles, feel
free to point me to more in case i missed something
tia
ts