Mac OS X Server
A server edition of the Mac OS, Mac OS X Server, based on BSD Unix-based operating system software Apple Computer acquired from Next Computer formed the basis of the current Mac OS X.Prior to OS X, Apple's Appleshare services provided server applications such as file and printer sharing and user management.
As of version 10 of the Mac OS, the server and the standard version are nearly identical; OS X Server mainly adds server management software - web, mail and user services. Most of OS X Server's services are based on standard BSD tools, for example the Apache web server; OSXS adds a GUI interface to these services. An exception is User services which are based on (Next) NetInfo.
See also: Mac OS.