http://developers.de/blogs/damir_dobric/archive/2012/08/02/announcing-windows-azure-authentication-library.aspxMicrosoft has just announced Windows Azure Authentication Library in the Windows Azure AD Developer Preview. The library enables you to: Prompt the user to authenticate against Windows Azure AD directory tenants, AD FS 2.0 servers and all the identityenCommunityServer 2008 SP1 (Build: 30619.63)