Xenix (English Wikipedia)

"Xenix variant information". 2010-02-26. Archived from the original on 2013-12-19. In the late 1970s Microsoft licensed Unix source code from AT&T, which at the time was not licensing the name Unix.

doi.org

Korn, Philip A.; McAdaragh, John P.; Tondo, Clovis L. (1985). "Expanded personal computing power and capability". IBM Systems Journal. 24 (1): 26–36. doi:10.1147/sj.241.0026.
Gligor, Virgil D.; Chandersekaran, C. Sekar; Chapman, Robert S. (February 1987), "Design and Implementation of Secure Xenix", IEEE Transactions on Software Engineering, SE-13 (2): 208–221, doi:10.1109/tse.1987.232893, ISSN 0098-5589, S2CID 15376270

Lévénez, Éric (2011-05-01). "UNIX History". levenez.com. Retrieved 2011-05-18.

"California firm acquires Unix-systems leader". The Ottawa Citizen. Canadian Press. 1990-05-10. p. H8 – via Newspapers.com.

Flynn, Laurie (1995-04-24). "The Executive Computer". The New York Times. ISSN 0362-4331. Retrieved 2010-04-14.

"SCO Company History". Operating System Documentation Project. Retrieved 2008-05-14.

Photograph of Lisa Xenix Multiplan diskette (JPEG) (Digital photography). Postimg.com. Retrieved 2019-09-24.

Isenberg, Sara (2016-04-21). "Watch: A look-back conversation with Doug Michels, co-founder of SCO". Santa Cruz Tech Beat. See around 10:45 mark of interview video.

Gligor, Virgil D.; Chandersekaran, C. Sekar; Chapman, Robert S. (February 1987), "Design and Implementation of Secure Xenix", IEEE Transactions on Software Engineering, SE-13 (2): 208–221, doi:10.1109/tse.1987.232893, ISSN 0098-5589, S2CID 15376270

Overview of the Xenix 286 Operating System (PDF). Intel Corporation. November 1984. Xenix 286 is Intel's value-added version of the Xenix operating system released by Microsoft Corporation.
Gazelle II 16-bit Micro-Computer (PDF), Seattle Computer Products, Inc., 1983, archived (PDF) from the original on 2022-08-11

"UNIX Expo — Remarks by Bill Gates". Microsoft. 1996-10-09. Archived from the original on 2001-08-18. Retrieved 2013-09-09.
"Xenix variant information". 2010-02-26. Archived from the original on 2013-12-19. In the late 1970s Microsoft licensed Unix source code from AT&T, which at the time was not licensing the name Unix.
Gazelle II 16-bit Micro-Computer (PDF), Seattle Computer Products, Inc., 1983, archived (PDF) from the original on 2022-08-11
Microsoft Xenix 3.0 ready for 286 Archived January 7, 2014, at the Wayback Machine
"Microsoft's Migration to Microsoft Exchange Server - The Evolution of Messaging within Microsoft Corporation". Microsoft. Archived from the original on 2005-04-27.

"Altos Unveils 16-Bit Micros With Unix, 1M-Byte Memory". Computerworld: The Newsweekly of Information Systems Management. Computerworld: 49–50. 1981-11-23. ISSN 0010-4841.
Halamka, John (1983-11-07). "Review: Altos 586". InfoWorld: 89. ISSN 0199-6649.
"Computerworld". Computerworld: The Newsweekly of Information Systems Management. IDG Enterprise: 77–. 1987-10-26. ISSN 0010-4841.
Flynn, Laurie (1995-04-24). "The Executive Computer". The New York Times. ISSN 0362-4331. Retrieved 2010-04-14.
Gligor, Virgil D.; Chandersekaran, C. Sekar; Chapman, Robert S. (February 1987), "Design and Implementation of Secure Xenix", IEEE Transactions on Software Engineering, SE-13 (2): 208–221, doi:10.1109/tse.1987.232893, ISSN 0098-5589, S2CID 15376270