Forefront Client Security (FCS) v1.0 is fully supported on Windows 7 and Windows Server 2008 R2 as of August 31, 2009. “With the release of new updates available through Windows Server Update Services or Microsoft Update, customers will be able to extend the protection of FCS v1.0 on Windows 7 Business, Enterprise, Home, and Ultimate and Windows Server 2008 R2 Standard Server and Windows Server 2008 R2 Enterprise Server systems and incorporate security in their infrastructure upgrade plans,” announced.

More info: KB974253 | TechNet