i have a server running win nt4.0 and exchange 5.5 and this is the only server in my network and i have 20 clients running win98 and outlook2000, now what i have done is that i took the win nt4.0 server offline and i bought a brand new pc i installed windows2000 server on the new pc and exchange 2000, i configured the new pc network settings exactly the same settings as the win nt4.0 (same ip, FQDN,DNS,etc…). and the i added all the mail users and domain users that were configured on the win nt4.0 server. i tested the new mail server and it worked fine it send and recived from external mail servers, now when i replaced that new pc instead of the win nt4.0 server and when the clients try send and recieve the outlook reports that it cant find the mail server, when i restarted the clients pc it couldnt log onto the domain,,, y is that happening while the new pc has exactly the same settings as the old server, can any one help me plz urgently. thnx