MSN Messenger is an instant messaging program that lets you send instant messages with cool emoticons, send pictures and other files to your friends, call a phone anywhere in the world from your computer, see when someone is typing a message to you, page a contact's mobile phone, and much more.
A list of changes has not yet been posted by Microsoft or on the Messenger website.
News source: Microsoft Download Center
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Download: MSN Messenger 5.0.0543 for Windows XP (2442 KB)