For Lync Server 2013, the basic requirement for the operating system platform is Windows Server 2008 R2 with Service Pack 1 or Windows Server 2012. The use of workloads in virtual environments for cost-efficient and energy-saving operations as well as the ability to combine various virtualization technologies from any manufacturer is new to Lync. As we already know, a high-availability environment can be created in the Enterprise Edition of the Lync Server 2013 and with virtualization, it can be used to create another version of this high-availability infrastructure to reduce the hardware implementation cost for Lync.