Windows Live Messenger(MSN) (MSN, Windows Live Messenger)

Website/Download: http://download.live.com/
License: Freeware
OS: Windows Mac
Latest Version: 15.0
Publisher's description:
Windows Live Messenger, commonly referred to by the previous names of MSN Messenger or MSN for short, is an advertisement-supported instant messaging client for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7 and Windows Mobile, first released on July 22, 1999 by Microsoft. It is part of Microsoft's Windows Live set of online services.