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===SCO UNIX/SCO Open Desktop=== In 1987 [[AT&T Corporation]], [[Microsoft]], and [[Sun Microsystems]] agreed to combine their versions of the [[Unix]] operating system. [[Santa Cruz Operation]] (SCO) sublicensed Microsoft's [[Xenix]] and wanted to retain the Xenix name, but AT&T said "If they want to call it Unix, they've got to use it the way it is. We don't want another set of variants".<ref name="patton19880118">{{Cite magazine |last=Patton |first=Carole |date=18 January 1988 |title=AT&T Unix Standard Could Impact Santa Cruz Operation |url=https://books.google.com/books?id=Dz8EAAAAMBAJ&pg=PA33#v=onepage&q&f=false |access-date=2025-05-25 |magazine=[[InfoWorld]] |page=33 |volume=10 |issue=3}}</ref> SCO UNIX was the successor to Xenix, derived from [[UNIX System V|UNIX System V Release 3.2]] with an infusion of Xenix device drivers and utilities. SCO UNIX System V/386 Release 3.2.0 was released in 1989, as the commercial successor to SCO Xenix. The base operating system did not include [[TCP/IP]] networking or [[X Window System]] graphics; these were available as optional extra-cost add-on packages. Shortly after the release of this bare OS, SCO shipped an integrated product under the name of SCO Open Desktop, or ODT. 1994 saw the release of SCO MPX, an add-on [[symmetric multiprocessing|SMP]] package. At the same time, AT&T completed its merge of Xenix, [[BSD]], [[SunOS]], and [[UNIX System V|UNIX System V Release 3]] features into [[UNIX System V Release 4]]. SCO UNIX remained based on System V Release 3, but eventually added home-grown versions of most of the features of Release 4. The 1992 releases of SCO UNIX 3.2v4.0 and Open Desktop 2.0 added support for long [[file name]]s and [[symbolic link]]s. The next major version, OpenServer Release 5.0.0, released in 1995, added support for [[Executable and Linkable Format|ELF]] executables and dynamically linked [[shared object]]s, and made many kernel structures dynamic.
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