Lion (version 10.8), there is only one Administrative tool, an app called "Server", which can be bought and downloaded from the Mac App Store, and is updated independently of OS X. This Server tool is used to configure, maintain and monitor one or more macOS Server installations. Server services Apple's Address Book Server, iCal Server, Wiki Server, and Web Server are mostly written in the Python programming language, relying on the Twisted framework. Most of these services were discontinued and removed in version 5.7.1 of the Server app, released on September 30, 2018. Address Book Server Address Book Server is a contacts server, and the first commercial server to have implemented CardDAV, which relies on the WebDAV protocol. It was added in Mac OS X Server 10.6. iCal Server iCal Server is the first commercial calendar server to have implemented the CalDAV standard, built on top of WebDAV. iCal Server was added in Mac OS X Server 10.5, and was also released under the open-source Apache License 2.0 as Darwin Calendar Server. The server, named "", is a daemon background service. It has been ported to non-Apple computer platforms. It is currently possible to install it on FreeBSD and several flavours of Linux. The server uses an SQL database for storage of calendar data. iChat Server iChat Server is an XMPP server that was added in Mac OS X Server 10.4, and was upgraded to version 2 with the release of Mac OS X 10.5 Server in October 2007. iChat Server was originally based on jabberd 1.4.3 and is named after Apple's iChat online chat client software. Version 2 of the software is based on jabberd2 2.0s9 and supports server federation, which allows chat clients to talk directly with other systems that support XMPP. It also supports server-based chat archiving. Discontinuation On April 21, 2022, Apple announced that they have discontinued macOS Server and that the most popular features (Caching Server, File Sharing Server, and Time Machine Server) are already bundled with every copy of macOS High Sierra and later, so customers will still have access to them. Existing macOS Server customers can still download and use the app with macOS Monterey. Technical specifications File and print services Mac (AFP, AppleTalk PAP, IPP) Windows (SMB/CIFS: Apple SMBX in Lion Server — previously Samba 2, IPP) Unix-like systems (NFS, LPR/LPD, IPP) Internet (FTP, WebDAV) Directory services and authentication Open Directory (OpenLDAP,