http://developers.de/blogs/damir_dobric/archive/2011/04/30/net-framework-updates-available.aspxFollowing two downloads are especially interesting for developers who build connected systems and use WF, AppFabric and co. KB2478063 This is a Platform Update to the Microsoft .NET Framework 4 containing a set of new features addressing top customerenCommunityServer 2008 SP1 (Build: 30619.63)