Service packs always make me smile.
Service Pack 1 (SP1) for Windows 7 and Windows Server 2008 R2 is now officially supported by Team Foundation Server 2010. I’ll add this information to the System requirements topic on MSDN later this month. For now, if you have TFS 2010 installed and you have been waiting and wondering if you can safely upgrade your OS to the latest service pack, you can do so with confidence.
Grab the Windows 7 SP1 and Windows Server 2008 R2 SP1 here.