Xenix
| Xenix under Bochs | |
| Developer | Microsoft, SCO, HCR, Logica | 
|---|---|
| OS family | Unix (SysV) | 
| Working state | Historic | 
| Source model | Closed source | 
| Initial release | 1980 | 
| Latest release | System V Release 2.3.4 / 1991 | 
| Platforms | PC/XT, x86, PDP-11, Z8001, 68k | 
| Kernel type | Monolithic kernel | 
| Default user interface | Command-line interface | 
| License | Proprietary | 
| Succeeded by | SCO UNIX, OS/2 | 
Xenix is a discontinued Unix operating system for various microcomputer platforms, licensed by Microsoft from AT&T Corporation. The first version was released in 1980, and Xenix was the most common Unix variant during the mid- to late-1980s. The Santa Cruz Operation (SCO) acquired exclusive rights to the software, and eventually replaced it with SCO UNIX, later known as OpenServer, with the final Xenix version released in 1991.