is a freeware instant messaging client that was developed and distributed by Microsoft between 1999 and 2005 for computers running the Microsoft Windows operating system, and aimed towards home users. MSN Messenger was renamed Windows Live Messenger
in February 2006 as part of Microsoft's Windows Live series of online services and software.
The main use of the software is for instant messaging, although other features which now come as standard include support for voice conversations, webcams (MSN Messenger
7.0 and later feature full screen audio video conversations), transferring files, and built-in two-player online games such as tic-tac-toe. In a similar vein to many of MSN Messenger's
competitors, MSN Messenger
allows messages to be enlivened with graphical emoticons, sometimes called smileys, Flash animations called winks, animated display pictures, styled text, and many more with third-party add-ons.Source: Wikipedia