MacOS Server

Mac OS X ServerOS X ServerMac OS X Server 10.4Mac OS X Server 10.5Mac OS X Server 10.6serverMac OS X Lion ServerMac OS X Server 10.0Mac OS X Server 10.1Mac OS X Server 10.2
macOS Server is a product formerly called Mac OS X Server and OS X Server.wikipedia
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MacOS

Mac OS XOS XMac
Mac OS X Server was a stand-alone operating system whereas macOS Server is sold as an operating system add-on (or app) that provides additional server programs along with management and administration tools for iOS and macOS. Prior to version 10.7 (Lion), Mac OS X Server was a separate but similar Unix server operating system from Apple Inc. architecturally identical to its desktop counterpart Mac OS X.
Between 1999 and 2009, Apple sold a separate series of operating systems called Mac OS X Server.

Aqua (user interface)

AquaAqua user interfaceAqua interface
Mac OS X Server 10.0 included the new Aqua user interface, Apache, PHP, MySQL, Tomcat, WebDAV support, Macintosh Manager, and NetBoot.
Aqua is the successor to Platinum, which was used in Mac OS 8, Mac OS 9 and Mac OS X Server 1.2.

Operating system

operating systemsOScomputer operating system
Mac OS X Server was a stand-alone operating system whereas macOS Server is sold as an operating system add-on (or app) that provides additional server programs along with management and administration tools for iOS and macOS. Prior to version 10.7 (Lion), Mac OS X Server was a separate but similar Unix server operating system from Apple Inc. architecturally identical to its desktop counterpart Mac OS X.
Since then, six more distinct "client" and "server" editions of macOS have been released, until the two were merged in OS X 10.7 "Lion".

Apple Filing Protocol

AFP
These tools simplify access to key network services, including a mail transfer agent, AFP and SMB servers, an LDAP server, a domain name server, and others.
AFP 3.0 was introduced in Mac OS X Server 10.0.3, and was used through Mac OS X Server 10.1.5.

Xserve

Xserve G5Xserve (Intel)
Mac OS X Server was provided as the operating system for Xserve computers, rack mounted server computers designed by Apple.
On August 28, 2009 Xserve was updated to ship standard with Mac OS X Server 10.6 Unlimited Client Server.

Apple Open Directory

Open DirectoryOpenDirectory
The 10.2 Mac OS X Server release includes updated Open Directory user and file management, which with this release is based on LDAP, beginning the deprecation of the NeXT-originated NetInfo architecture.
In the context of macOS Server, Open Directory describes a shared LDAPv3 directory domain and a corresponding authentication model composed of Apple Password Server and Kerberos 5 tied together using a modular Directory Services system.

WebObjects

Apple File Services, Macintosh Manager, QuickTime Streaming Server, WebObjects, and NetBoot were included with Mac OS X Server 1.0 – 1.2v3.
From May 2001 WebObjects was included with Mac OS X Server, and no longer required a license key for development or deployment.

Apple Inc.

AppleApple ComputerApple Inc
Prior to version 10.7 (Lion), Mac OS X Server was a separate but similar Unix server operating system from Apple Inc. architecturally identical to its desktop counterpart Mac OS X.
Apple's range of server software includes the operating system macOS Server; Apple Remote Desktop, a remote systems management application; and Xsan, a storage area network file system.

Mac OS X Server 1.0

Mac OS X ServerMac OS X Server 1.0 through 1.2 v3original version
The first version of Mac OS X was Mac OS X Server 1.0.
Mac OS X Server was never officially known simply as Mac OS X, and was ultimately rendered obsolete by Mac OS X v10.0 in 2001 and macOS Server.

Messages Server

iChat Server
The 10.4 release adds 64-bit application support, Access Control Lists, Xgrid, link aggregation, e-mail spam filtering (SpamAssassin), virus detection (ClamAV), Gateway Setup Assistant, and servers for Software Update, iChat Server using XMPP, Boot Camp Assistant, Dashboard, and weblogs.
Messages Server is a component of OS X Server from Apple Inc. It was first introduced as iChat Server with the release of 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.

NetBoot

NetInstall
Mac OS X Server 10.0 included the new Aqua user interface, Apache, PHP, MySQL, Tomcat, WebDAV support, Macintosh Manager, and NetBoot. Apple File Services, Macintosh Manager, QuickTime Streaming Server, WebObjects, and NetBoot were included with Mac OS X Server 1.0 – 1.2v3.
The technology was announced as a part of the original version of Mac OS X Server at Macworld Expo on 5 January 1999.

Xgrid

Xgrid Admin
The 10.4 release adds 64-bit application support, Access Control Lists, Xgrid, link aggregation, e-mail spam filtering (SpamAssassin), virus detection (ClamAV), Gateway Setup Assistant, and servers for Software Update, iChat Server using XMPP, Boot Camp Assistant, Dashboard, and weblogs.
The Xgrid controller, the job scheduler of the Xgrid operation, is also included within Mac OS X Server and as a free download from Apple.

Samba (software)

SambaSamba softwareSamba4
The inclusion of Samba version 3 allows tight integration with Windows clients and servers.
Samba runs on most Unix, OpenVMS and Unix-like systems, such as Linux, Solaris, AIX and the BSD variants, including Apple's macOS Server, and macOS client (Mac OS X 10.2 and greater).

Wiki Server

Apple Teams
Lion Server includes new versions of iCal Server, Wiki Server, and Mail Server.
Wiki Server was a set of services which have shipped with all versions of Mac OS X Server since v10.5 until macOS High Sierra.

PostgreSQL

PostgresPgSQLPgAdmin
It is the default database for macOS Server, and is also available for Linux, FreeBSD, OpenBSD, and Windows.

Server Assistant

Server Assistant is the first program that is run after an install of Mac OS X Server.

Workgroup Manager

Workgroup Manager is a computer program bundled as part of OS X Server for directory-based management of users, groups and computers across a network.

Clam AntiVirus

ClamAVClamAV Virus DatabaseKlamAV
The 10.4 release adds 64-bit application support, Access Control Lists, Xgrid, link aggregation, e-mail spam filtering (SpamAssassin), virus detection (ClamAV), Gateway Setup Assistant, and servers for Software Update, iChat Server using XMPP, Boot Camp Assistant, Dashboard, and weblogs.
Apple macOS Server has included ClamAV since version 10.4.

Server (computing)

serverserversserver computer
Mac OS X Server was provided as the operating system for Xserve computers, rack mounted server computers designed by Apple.
Proprietary operating systems such as z/OS and macOS Server are also deployed, but in much smaller numbers.

Mac Mini

Mac Mini ServerMac Mini (Mid 2010)Mac Mini G4
Also, it was optionally pre-installed on the Mac Mini and Mac Pro and was sold separately for use on any Macintosh computer meeting its minimum requirements.
The first Server model came preloaded with an OS X Server version of OS X, but later models instead came preloaded with the standard version of OS X, as well as a separate OS X Server package, which included separate component apps (including "Server App", "File Sharing", "Wiki Server", "Profile Manager", etc.).

Mac Pro

MacPro2019 Mac ProApple Mac Pro
Also, it was optionally pre-installed on the Mac Mini and Mac Pro and was sold separately for use on any Macintosh computer meeting its minimum requirements.
The Mac Pro Server includes an unlimited Mac OS X Server license and an Intel Xeon 2.8 GHz Quad-Core processor, with 8 GB of DDR3 RAM.

OpenStep

OPENSTEP EnterpriseOPENSTEP/MachOPENSTEP for Mach
Mac OS X Server 1.0 – 1.2v3 were based on Rhapsody, a hybrid of OPENSTEP from NeXT Computer and Mac OS 8.5.1.
After replacing the Display Postscript WindowServer with Quartz, and responding to developers by including better backward compatibility for classic Mac OS applications through the addition of Carbon, Apple released Mac OS X and Mac OS X Server, starting at version 10.0; Mac OS X is now named macOS.

NeXT

NeXT ComputerNeXT Inc.NeXT Software
The GUI looked like a mixture of Mac OS 8's Platinum appearance with OPENSTEP's NeXT-based interface.
WebObjects is now bundled with macOS Server and Xcode.

System Image Utility

System Image Utility is an application for making NetBoot and other image sets to be used with Mac OS X Server.

NetInfo

The 10.2 Mac OS X Server release includes updated Open Directory user and file management, which with this release is based on LDAP, beginning the deprecation of the NeXT-originated NetInfo architecture.
Apple has moved away from using NetInfo towards LDAP, particularly in Mac OS X Server.