Every Mac OS X Unix certification by The Open Group:
- 10.0 (Cheetah): N/A
- 10.1 (Puma): N/A
- 10.2 (Jaguar): N/A
- 10.3 (Panther): N/A
- 10.4 (Tiger): N/A
- 10.5 (Leopard)
- 10.6 (Snow Leopard)
- 10.7 (Lion): N/A
- 10.8 (Mountain Lion)
- 10.9 (Mavericks)
- 10.10 (Yosemite)
- 10.11 (El Capitan)
- 10.12 (Sierra)
- 10.13 (High Sierra)
- 10.14 (Mojave)
- 10.15 (Catalina)
Andrew Josey, VP Standards & Certification of the Open Group confirms that 10.7 (Lion) was not certified.