Hmm thats odd, it works for me. I can talk with 3+ people and use commands.
I have MSN Messenger 7.5 and the same plus version. I assume you have the "Enable Command Helper Window" and the "allow use of commands and tags" options checked (Plus-> Prefs -> Message Helpers -> Commands and Keys) as it does work when you are talking with less then 3 people. Maybe it has something to do with you having Windows 2000, I am not sure.
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