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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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Memory Requirements

To meet the support requirements, each Lync Server virtual machine must be allocated a minimum of 15 GB of RAM. This memory should be allocated exclusively for each virtual machine. Hyper-V Service Pack 1 has a new feature called Dynamic Memory that allows defining startup and maximum RAM values for a virtual machine. This feature should not be used with Lync Server 2010, or if it is, the startup RAM for each VM should be at least 15 GB to guarantee that amount is always available.

Likewise, virtual machines that run on VMware should not be overcommitted on memory. VMware allows administrators to collectively assign more memory to virtual machines than is actually physically installed in the host server. This feature cannot ...

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