Windows Messenger v5, Windows 2000 Exchange sign in error

[news.microsoft.com]

Greetings,



I am using:



Windows 2000 Server

Windows 2000 Exchange

Windows XP Professional

Windows Messenger v5



I am trying to connect to the exchange im server. I am able to connect
without problems if the user is a member of the Administrator group (even
indirectly).





I enter the user name in the Tools | Options dialog box on the Accounts tab.
I use the same format as the successful logins. I refer to the Active
Directory entry for the login name.



When I try to login, I am presented with a dialog box asking for E-Mail,
User Name, Password, Domain.



I fill in the information.



This is successful for the accounts of users belonging to the Administrator
group. For the other user accounts I am getting an error message:



Windows Messenger

Signing in to Microsoft Exchange Instant Messaging failed because the
password is incorrect or the sign-in name does not exist.



All the accounts have Windows Messenger activated in the Active Directory.



Could this be a permissions problem? If so, where do I need to apply the
proper permissions? Does anyone have another idea of where the problem
might be?



Thanks for your time and help.



Arek