http://blogs.technet.com/bpaulblog/archive/2008/07/08/free-unlimited-installation-and-compatibility-support-for-windows-vista-sp1.aspxFree unlimited installation and compatibility support is available for Windows Vista, but only for Service Pack 1 (SP1). This support for SP1 is valid until March 18, 2009. Chat and e-mail support is available only in the United States and Canada. Someen-USCommunityServer 2.1 SP1 (Build: 61025.2)