http://blogs.technet.com/b/uspartner_ts2team/archive/2010/10/09/which-im-protocol-does-microsoft-use.aspxQ: (from Bill) I was looking at a telephone system for which they demonstrated "presence." I asked if was compatible with Microsoft's presence, and he said it depended on whether MS is xmpp compatible. Is it? If not, what protocols does MS presenceen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)