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Microsoft has released a new whitepaper on Server Virtualization in Microsoft Lync Server 2010.  This document outlines a series of best practice recommendations for running Lync Server 2010 in a virtualized environment.

The document replaces the first virtualization support whitepaper with new sizing guidelines, as shown above.  Virtualization of Lync Server 2010 reduces the number of supported users by roughly half, primarily due to the fact that Hyper-V supports a maximum of 4 cores (half the number of recommended cores in a physical enviroment).

http://www.microsoft.com/download/en/details.aspx?id=22746