Outlook 2003 problems connecting to Exchange Server 2000

[yankel]

After updating windows the week of October 9, Outlook 2003 won't
connect to our server. It will not resolve the mailbox/name of the
client. All of the outlook 2002 still work and we can access the
account through the other clients but not through the windows xp
client with Outlook 2003 installed. Everything worked fine up until
last week.

Thanks in advance for any help.

Gary