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.NET Framework 4.0 is supported on Windows XP (with Service Pack 3), Windows Server 2003, Vista, Server 2008, 7 and Server 2008 R2. Applications utilizing .NET Framework 4.0 will also run on computers with .NET Framework 4.5 or 4.6 installed, which supports additional operating systems. .NET Framework 4.0 is the last version to support Windows XP and Windows Server 2003.