Microsoft made available the General Distribution Release for lab management in Visual Studio 2010 to licensed customers. You need to install the patch (linked below) on following machines: “Team Foundation Server, Client machine (i.e. machine running Microsoft Test Manager), Visual Studio Test Controller Build machines, All virtual machines and templates that’re part of your environments. The patch has updates for the agents installed on VMs.”
If you haven’t configured lab management already, this page has useful links to help you get started and setup lab management.