Microsoft Cairo

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Codename(s) Cairo
Kernel version NT 4.0
CPU Architecture x86
Release date {{{release}}}
Licence {{{licence}}}
Support end {{{support}}}
Other versions

Microsoft Cairo is the codename of an unreleased software project by Microsoft, meant to bring next-generation technologies for Microsoft's NT Based Operating Systems. The project was originally announced at the 1991 PDC (Professional Developers Conference) and later demoed at the 1993 PDC.


  • Cairo Advanced Desktop was designed as the Client for Cairo servers. It would have included the core OS, new user interface, and networked storage/printer sharing.
  • Cairo Advanced Server was designed
  • Cairo Development Environment


  • No information available
  • Existence doubtful
  • Information or pictures available
  • Leaked or released