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Windows Identity Foundation (WIF) is a Microsoft software framework for building identity-aware applications.[1] It provides APIs for building ASP.NET or WCF based security token services as well as tools for building claims-aware and federation capable applications.[2][3]
Windows Identity Foundation is supported on IIS 6/Windows Server 2003, IIS 7/Windows Vista, Windows Server 2008 and Windows 7. Version 1.0 shipped as a standalone product, but the product is now included as a part of Microsoft .NET Framework v4.5.[4][2]