 Prior to version 10.7 (Lion), Mac OS X Server was a separate but similar Unix server operating system by Apple Inc., that was architecturally identical to its desktop counterpart Mac OS X.With the release of version 10.7 (Lion), Mac OS X and Mac OS X Server were combined into one release.A separate "server" operating system is no longer sold; the server-specific server applications and work group management and administration software tools from Mac OS X Server are now offered as macOS Server, an add-on package for macOS sold through the Mac App Store, along with Workgroup Manager 10.8, available from the Apple support web site.