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Xenix
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<p>Xenix is a discontinued <a href="/facts/Unix/0pNL2seI">Unix</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a> for various <a href="/facts/Microcomputer/ETW22UTv">microcomputer</a> platforms, licensed by <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a> from <a href="/facts/AT%26T_Corporation/BfsX7eX2">AT&T Corporation</a>. The first version was released in 1980, and Xenix would eventually become the most common Unix variant, measured according to the number of machines on which it was installed, in the mid-to-late 1980s. The <a href="/facts/Santa_Cruz_Operation/jLoYByEf">Santa Cruz Operation</a> (SCO) later acquired exclusive rights to the software, and eventually replaced it with SCO UNIX, later known as <a href="/facts/OpenServer/MuIplPGX">OpenServer</a>, with the final Xenix version released in 1991. </p>