Xenix

Xenix was a computer operating system derived from the UNIX system. It was developed by Microsoft in the 1980s; after which it was transformed by Santa Cruz Operation (SCO) into SCO UNIX.

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Xenix was Microsoft's version of UNIX intended for use on microprocessors, but they called it Xenix because it could not license the "UNIX" name.

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Microsoft purchased a license for UNIX 7th Edition from AT&T in 1979, and announced on August 25, 1980 that it would make it available for the 16-bit microcomputer market.

Operating system: In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. Additionally, it provides a foundation upon which to run application software such as word processing programs and web browsers....

Microsoft: Microsoft Corporation is the world's biggest software company, with over sixty thousand employees and a physical presence in over sixty countries as of 2005. It was founded in 1975 by Bill Gates and Paul Allen, and is headquartered in Redmond, Washington, USA. Microsoft develops, manufactures, lic...

Santa Cruz Operation: Santa Cruz Operation (SCO) was a software company based in Santa Cruz, California which was best known for selling three Unix variants for Intel x86 processors: Xenix, SCO UNIX (later known as SCO OpenServer), and UnixWare. Eric Raymond, in his book The Art of Unix Programming, calls SCO the "first ...