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In 1980, Microsoft released its own version of Unix called Xenix. This system is a closed-source 16-bit operating system. Xenix was succeeded by SCO OpenServer which was originally developed by Santa Cruz Operation (SCO), but is now maintained by Xinuos. Xenix uses a monolithic kernel and the system is based on System V. Xenix uses "Visual Shell" rather than the Unix shell like other System V Unix systems.
In 1987, Microsoft sold Xenix to SCO for 25% ownership of SCO. That same year, SCO ported Xenix to 32-bit. Later, Microsoft released the last Xenix patch in 1989. Afterwards, SCO turned Xenix into SCO OpenServer (also called "SCO UNIX").
Xenix works on PC/XT, x86, PDP-11, Z8001, and 68k processors. Xenix 2.0 was based on Unix 7, and Xenix 3.0 was based on Unix System III.
In 1981, Microsoft had planned to merge MS-DOS and Xenix to make XEDOS.
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