http://msexchangeteam.com/archive/2008/06/12/449007.aspx
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Video Conferencing for Masses vs. Personal Telepresence “SIP Trunking” in Office Communications Server Simplifying Enhanced Presence Recent Yahoo! and MSN (Windows Live) Public IM Connectivity Changes To UDP, or not to UDP, that is the question Office
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The authentication protocol that is used by Microsoft Office Communications Server 2007 and its clients has been updated to require a signature in all messages. This includes the first message that carries the challenge response. The version number of
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