- Windows XP and before don’t come with any version of .Net
- Windows Server 2003 comes with .Net 1.1
- Windows Vista comes with .Net 3.0
- Windows 2008 comes with .Net 3.0
- Windows 2008 R2 comes with .Net 3.5
- Windows 7 comes with .Net 3.5
Check one image showing the .Net Framework version comes default in OS
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