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Windows Live Messenger is Microsoft's instant messaging client application, which works with Windows Mobile, Windows 7, Windows Vista, Windows CE, Windows XP (up to Wave 3), Xbox 360, iOS, Java ME, Symbian OS 9, x.S60, Zune HD, and Blackberry. It uses the Microsoft Notification Protocol over Transmission Control Protocol (TCP) and HTTP to connect via Microsoft's .NET messenger service.
The MSN Messenger was originally released in 1999 and renamed as Windows Live Messenger in 2006.
Windows Live Messenger provides the following features:
Windows Live Messenger shares interoperability with the following applications:
Windows Live Messenger Companion, a Windows Internet Explorer add-on for website activity detection, uses Windows Live ID and integrates with Windows Live Messenger to obtain shared user contact lists and data contents.