The OS X Server 2.0 is a server operating system that was designed, developed, and sold by Apple from 2012 to 2014 alongside OS X 10.8 Mountain Lion. The system has been released on July 25, 2012, and was available for $19.99 from Mac App Store.
This software gets the last update (2.2.5) on October 16, 2014, and later has been replaced by a newer version OS X Server 3.0.
OS X Server 2.0 is a Unix server operating system architecturally identical to its desktop counterpart Mac OS X – with additional server programs and management and administration tools. As of version 10.8 Mountain Lion, Mac OS X, and Mac OS X Server were combined into one release and re-branded as OS X.
A separate “server” operating system is no longer sold; the server-specific server applications and workgroup management and administration software tools from Mac OS X Server are now offered as Server App, an add-on package for OS X sold through the Mac App Store along with Server Admin Tools, available from the Apple support website.
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. Also included (particularly in later versions) are numerous additional services and the tools to manage them, such as a web server, wiki server, chat server, calendar server, and many others.
Today OS X Server 2.0 is 11 years old!

OS X Server 2.0 General Information
Released | July 25, 2012 |
Original Price | $19.99 from the Mac App store |
System Requirements | Mac computer with OS X 10.8 2 GB of memory 8 GB of available disk space |
Distribution | Mac App Store |
Versions
Versions | Build | Release Date |
OS X Server 2.0.23 | 12S307 | July 25, 2012 |
OS X Server 2.1 | 12S363 | September 10, 2012 |
OS X Server 2.1.1 | 12S365 | September 27, 2012 |
OS X Server 2.2 | 12T134 | December 6, 2012 |
OS X Server 2.2.1 | 12T162 | February 4, 2013 |
OS X Server 2.2.2 | 12T214 | September 17, 2013 |
OS X Server 2.2.3 | 12T218 | September 17, 2014 |
OS X Server 2.2.4 | 12T220 | September 24, 2014 |
OS X Server 2.2.5 | 12T224 | October 16, 2014 |