Exchange Instant Messaging Temporarily unavailable

Hi,

Using Windows Messenger 5.1 on Windows XP Pro SP2 W/S and connected to an
Exchange 2000 server. Suddenly, when I try to log on I get the following
error message. "Signing in to Exchange Instant Messaging failed because the
service is temporarily unavailable. Try again later".

I can logon easily on a different workstation using the same account so the
problem must be related to the workstation I'm using. I have tried
uninstalling Messenger and re-installing but have had no success.

Any suggestions please?

John


.

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