What version of the .NET framework is installed on Windows XP, Vista, and 7?

From Wikipedia and MSDN:

.NET Framework 1.1: Windows Server 2003
.NET Framework 2.0: Windows Server 2003 R2
.NET Framework 3.0: Windows Vista, Windows Server 2008
.NET Framework 3.5: Windows 7, Windows Server 2008 R2
.NET Framework 4.0: n/a
.NET Framework 4.5: Windows 8, Windows Server 2012
.NET Framework 4.5.1: Windows 8.1, Windows Server 2012 R2
.NET Framework 4.5.2: n/a
.NET Framework 4.6: Windows 10
.NET Framework 4.6.1: Windows 10 v1511
.NET Framework 4.6.2: Windows 10 v1607, Windows Server 2016

.NET Compact Framework 1.0 (SP2): Windows Mobile 5.0
.NET Compact Framework 2.0: Windows Mobile 6.0 

From other SO questions:

  • Windows 7 – 3.5
  • Vista – 2.0 and 3.0
  • XP – not installed
  • XP SP2 – not installed
  • XP SP3 – not installed

If you want to be certain that you application runs on all of these, you will have to install the framework yourself – use SmallestDotNet.com for this.

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