Something for the weekend..! :)
Wanted to share with you that Mac Messenger 7 went live today with multi-party A/V support for OCS! It can be downloaded from here: http://www.microsoft.com/mac//downloads.mspx?pid=Mactopia_Messenger
More information on Mac Messenger is available here
http://www.microsoft.com/mac/products/messenger/default.mspx