Mac OS X Server

Mac OS X Server is a series of discontinued Unix-like server operating systems developed by Apple, based on macOS. It provided server functionality and system administration tools, and tools to manage both macOS-based computers and iOS-based devices, network services such as a mail transfer agent, AFP and SMB servers, an LDAP server, and a domain name server, as well as server applications including a Web server, database, and calendar server. Starting with OS X Lion, Apple stopped selling a standalone server operating system, instead releasing an add-on Server app marketed as OS X Server (and later macOS Server), which was sold through the Mac App Store. The Server app lacked many features from Mac OS X Server, and later versions of the app only included functionality related to user and group management, Xsan, and mobile device management through profiles. The Server app was discontinued on April 21, 2022, and Apple said that later versions of macOS would drop support for it.