Deploying the Lync 2010 Client to different architectures
The Lync Server 2010 client is a single unified communications client that replaces both the Office Communicator and Live Meeting clients. This single client performs all the functions of the previous clients, including instant messaging (IM), web conferencing
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Read the complete post at http://www.expta.com/2011/02/deploying-lync-2010-client-to-different.html