Microsoft Cairo

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Microsoft Cairo
Version of Microsoft Windows
Codename Cairo
Kernel NT 4.0
Architecture x86
Latest build 4.0.1175.1

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