Problem with Windows Messenger and Exchange 2000

Well, here I set, six days later and no reply. So much
for getting any help this way.

Thanks for nothing!

--Rick
>-----Original Message-----
>I believe I have set up everything I need on the Exchange
>2000 Server and Enable a couple of accounts, but when I
>try to log in to Windows Messenger 5.0, I get the
>following error message:
>
>Signing in to Microsoft Exchange Instant Messaging failed
>because the service is temporarily unavailable. Please
>try again later.
>
>I am setting this up for our corporate netowork and we
hav
>eonly one domain. We are, of course, running Active
>Directory.
>
>My workstation is XP, if that helps.
>
>Thanks -- Rick
>.
>