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Microsoft Internet Information Services (IIS; sometimes, erroneously called Server or System) is a set of Internet-based services for servers using Microsoft Windows. It is the world's second most popular web server in terms of overall websites behind the Apache web server although the gap is decreasing according to Netcraft.

The servers currently include FTP, SMTP, NNTP and HTTP/HTTPS.


  • IIS 1.0, Windows NT 3.51 Service Pack 3
  • IIS 2.0, Windows NT 4.0
  • IIS 3.0, Windows NT 4.0 Service Pack 3
  • IIS 4.0, Windows NT 4.0 Option Pack
  • IIS 5.0, Windows 2000
  • IIS 5.1, Windows XP Professional
  • IIS 6.0, Windows Server 2003 and Windows XP Professional x64 Edition
  • IIS 7.0, Windows Vista and Windows Server "Longhorn"

See also

External links

Free alternatives