I agree that integration with CoMo would be ideal and would imagine thats its going to be included in future releases, but remeber WM6 has Voip built in ( its just a SIP phone connection ), I'm about to try this on my test lab, OCS 2007, CCM5.1 got everything working so far apart from the Voip on WM6 device (HTC P3300)will update when have this working. If everything goes ok I'm planning on rolling out Tytan II's to all my users.