RTC Client API's and Windows Vista

FYI there's a new post on the Unified Communications Group blog regarding the RTC API's. The main point is that they're not included in Vista; as they we're in Windows XP. Furthermore Netmeeting is deprecated in Vista and the following limitations apply -

The IM, Presence, Voice and Video functionality of the RTC 1.3 APIs work on Vista RTM. While audio and video quality are acceptable the quality level does not match what users using Communicator 1.0 have experienced in the past.
Application sharing and white boarding require Windows NetMeeting, which Vista has replaced with Windows Meeting Space so these features of the RTC 1.3 APIs will not function on Windows Vista.