For the people who don't know it yet, Microsoft released a version of the web based messenger for all to test now. Just sign in and a new window will open and you'll see that it looks like the real MSN Messenger.
Right now the following languages are available: English, French, German and Japanese. More languages will follow later this year. MSN Web Messenger only supports sending instant messages. There is no support for webcams, voicechats or games at the moment.
Remember, this service is still in beta stages, the number of simultaneous connections to MSN Web Messenger is limited so it could be possible that you get a sign-in error.
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