XENIX
An operating system created by Microsoft in 1980 and marketed from 1982. It was based on code licensed from AT&T and was basically a subset of Release 7 of the UNIX system, adapted to fit smaller computer systems. The system remained Microsoft's main development and internal use system until Windows NT was released in the early 90's, but prior to that the company had sold the rights to the code, trademarks and distribution license for Xenix to the Santa Cruz Operation (SCO).
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