https://web.archive.org/web/19991002045556/http://apple.com/macos/ https://web.archive.org/web/19991002045556/http://apple.com/... Pre-OS X (what actually runs

https://web.archive.org/web/19991002045556/http://apple.com/macos/ https://web.archive.org/web/19991002045556/http://apple.com/... Pre-OS X (what actually runs in the blog post) it was Mac OS. Then, it was Mac OS X. The first version styled macOS was 10.12 Sierra in 2016.