Versions of Mac OS X Server prior to version 10.7 “Lion” were sold as complete, standalone server operating systems starting with Mac OS X 10.7 “Lion,” Mac OS X Server (and its successors OS X Server and macOS Server) have been offered as add-on software packages, sold through the Mac App Store, that are installed on top of a corresponding macOS installation. macOS Server adds server functionality and system administration tools to macOS and provides tools to manage both macOS-based computers and iOS-based devices. MacOS Server, formerly Mac OS X Server and OS X Server, is a series of Unix-like server operating systems based on macOS and later add-on software packages for the latter, developed by Apple Inc.
