macOS server was a GUI app that you install from the App Store on regular macOS: https://apps.apple.com/us/app/macos-server/id883878097?mt=12 https://apps.apple

macOS server was a GUI app that you install from the App Store on regular macOS: https://apps.apple.com/us/app/macos-server/id883878097?mt=12 https://apps.apple.com/us/app/macos-server/id883878097?mt=12 10.6 (Snow Leopard) was the last version where they sold a separate more expensive server edition of the OS. As for server hardware, I have to imagine the 3rd party 1U Mac Mini rack enclosures are already more popular than Apple's official rack mount Pro. https://www.sonnettech.com/product/rackmacmini.html https://www.sonnettech.com/product/rackmacmini.html Use case for datacenter Macs is basically just as build servers for Mac and iOS projects, anything else there's not much justification for the hardware cost.