All windows Operating Systems which were never released!!!!!!

1. Windows Cairo :- 

• Cairo was Bill gates vision of "information at your fingertips". Microsoft operating designers works on this operating system for almost 6 years 1991-1996.

• Cairo was announced at the 1991 Microsoft Professional Developers Conference by Jim Allchin.

• Microsoft also gave a demo O.S. to some pepole.

Some key-feature of Cairo OS

• Cairo used distributed computing.

• User interface developed for Cairo was later used in Windows 95.

   2. Nashville :-

• Nashville was operating system by Microsoft Windows scheduled to be released in 1996.

• Nashville added Internet integration features to the Windows 95 and NT 4.0 desktop.

• Nashville was the only operating system in which web browser (Internet Explorer 3.0) comes with inbuilt file manager.

• In Nashville Microsoft Office documents could be opened from Internet Explorer with the help of Activex Technology.

• Wallpaper could be replaced by dynamic web-pages.

[ Note:-Nashville OS beta version are available only for testers.but leaked OS copy is available on Internet ]

  3. Neptune 

• Neptune was Windows operating system that was based on Windows 2000 and was under development by Microsoft during 1999

• It was the first consumer version of Windows to be built on NT code instead of
  Windows 9x.

• Its user-interface is very smiler to Windows-XP.

• It has inbuilt firewall which was later integrated into Windows XP as the Windows Firewall !!

[ Note:- Neptune OS two beta versions are available only for testers.but leaked OS copy is available on Internet ]

Odyssey:-

• Odyssey was Windows operating system aimed at the business sector was based on Windows 2000 and was under development by Microsoft during 1999 based on NT kernel.

• Odyssey would have been called Windows NT 6.0