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Microsoft Messenger service. Messenger (formerly MSN Messenger Service, [1] .NET Messenger Service and Windows Live Messenger Service) was an instant messaging and presence system developed by Microsoft in 1999 for use with its MSN Messenger software.
Windows Messenger is a discontinued instant messaging client included in Windows XP. Designed for use by both corporate and home users, it was originally created, in 2001, as a streamlined and integrated version of MSN Messenger. It was upgraded several times when it was made available for Windows 2000 and Windows Server 2003.