Today Cisco bought Jabber, Inc., which is an open source messaging and presence protocol that is supported by Google Talk and is the backbone to services such as Twitter.  For Cisco this is the second major acquisition of a communications company, with WebEx being that company.

Cisco seems very intent on going after the enterprise communication space and eat into Microsoft’s Office Communication Server (OCS).  As the enterprise space becomes a more diverse land of Macs mixed with Windows boxes and LINUX boxes, this move may help Cisco accomplish those goals.  In the enterprise space, Jabber is used by some investment banks on Wall Street as well as an internal messaging service at companies like AT&T.