http://blogs.msdn.com/cenet/archive/2006/11/25/corrections-to-ce-rtc-1-5-documentation-on-msdn.aspxThere has been several documentation errors related to RTC 1.5 on MSDN. Here are a few of them: Issue 1: http://msdn2.microsoft.com/en-us/library/aa924993.aspx The following page mentions that RTC 1.5 supports multi party audio/video and application sessions.en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/cenet/archive/2006/11/25/corrections-to-ce-rtc-1-5-documentation-on-msdn.aspx#7134605Wed, 16 Jan 2008 23:53:12 GMT91d46819-8472-40ad-a661-2c78acb4018c:7134605cenet<p>All these issues have now been fixed on MSDN.</p> <p> - Rajesh Khetan.</p>