Microsoft Messenger Service
Messenger (formerly MSN Messenger Service, .NET Messenger Service and Windows Live Messenger Service) is an instant messaging and presence system developed by Microsoft in 1999 for use with its MSN Messenger software and used today by its instant messaging clients including Windows 8, Windows Live Messenger, Microsoft Messenger for Mac, Outlook.com and Xbox Live. Third-party clients also connect to the service. It communicates using the Microsoft Notification Protocol, a proprietary instant messaging protocol. The service allows anyone with a Microsoft account to sign in and communicate in real time with other people who are signed in as well.
Read more about Microsoft Messenger Service: Background, Criticism
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