You will need to sign-in with your SIP address. Sometimes this matches your email address, sometimes it doesn't. Do you know what your SIP address is or have an administrator your can ask?
Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog:
http://HowDoUC.blogspot.com | Twitter:
@twharrington