To determine which Microsoft IIS (Internet Information Services) is running on your PC you can check following table:
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IIS 1.0, Windows NT 3.51, SP3 or available as a free add-on
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IIS 2.0, Windows NT 4.0
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IIS 3.0, Windows NT 4.0 SP3 (IIS 2.0 is automatically upgraded to IIS 3.0 during the install of SP3)
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IIS 4.0, Windows NT 4.0 Option Pack
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IIS 5.0, Windows 2000
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IIS 5.1, Windows XP Professional, Windows MCE
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IIS 6.0, Windows Server 2003, Windows XP Professional x64 Edition
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IIS 7.0, Windows Server 2008, Windows Vista
Up to date list is available here
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