In order to use this evaluation package you will need to have Microsoft Hyper-V installed on a physical machine.
Hyper-V is available on Windows Server 2008 R2 and the details on how to install Hyper-V can be found here. Details of how to setup the VHD are included in the documentation that accompanies the product.
To find out more about the VHD Test Drive program, please visit www.microsoft.com/vhd
To find more information about Lync Server 2010, please visit www.microsoft.com/lync