Editing Xenix (section)

=== Replacement ===
By 1988 AT&T reported that Xenix developers were about half of the 500,000 Unix licenses worldwide.<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 released its [[SCO Unix]] as a higher-end product, based on System V R3 and offering a number of technical advances over Xenix; Xenix remained in the product line. In the meantime, AT&T and [[Sun Microsystems]] completed the merge of Xenix, BSD, [[SunOS]] and System V R3 into System V R4. The last version of SCO Xenix/386 itself was System V R2.3.4, released in 1991.<ref>{{harvnb|Pate|1996|page=10}}</ref>