Microsoft Lync (formerly Microsoft Office Communicator) and Microsoft Lync for Mac are instant messaging clients used with Microsoft Lync Server or Lync Online available with Microsoft Office 365 and Live@Edu. They are replacements for Windows Messenger which was used with Microsoft Exchange Server. Both Microsoft Lync and Microsoft Lync for Mac are enterprise software; unlike Windows Live Messenger, they have a different feature set that is targeted toward corporate environments. As of January 25, 2011 Microsoft Lync 2010 was generally available. The previous version was Office Communicator 2007 R2, released on March 19, 2009. An even earlier version, "Office Communicator 2007" was released to manufacturing on 28 July 2007 and launched on October 27, 2007. The full-featured desktop version of the client requires Windows 7, Windows Vista or Windows XP with Service Pack 2 or newer.
Contributions by FleetCommand, Codename Lisa, and Reubeny.