The first Mac software was called System 1 and it was released on January 24, 1984, and there have been 30 major updates since. Apple rebranded to Mac OS with the release of mac OS 8 on July 26, 1997.

While Apple is very keen that its macOS software is only ever run on Macs, there are numerous options for doing the opposite and running Windows on Apple computers. If you're a developer, or need ...