I have setup OCS 2007 server and have it working with the sip being the users email addresses which is the usual user@externaldomain.com. Comminicator, Web Access and everything works and signs in using the e-mail address. However when I install the Outlook addin for Live meeting and try to test the connection it fails. Live Meeting works and opens up though when initialized from Communicator. The error I get when trying to launch from outside Communicator is: " Cannot connect to server because the information in the User Accounts dialog might be incorrect or improperly formatted. Please verify that this information ....." I then changed the sip to be the user@internaldomain.com matching the user logon name in Active Directory and voila it works. I want to be able to use the sip of the users e-mail address and have Live Meeting work is this possible or does the sip have to match the user logon name in AD for Live Meeting to work. I wouldn't think it would have to, am I just missing something? I have installed all Microsoft Updates on both the client and the server. Live Meeting client version is 8.0.6362.91. Thanks,