Mac OS X Server is the server-oriented version of Apple's operating system, Mac OS X. Mac OS X, in both desktop and server versions, is a Unix operating system based on technology that Apple acquired from NeXT Computer.
The server version of Mac OS X includes applications that are intended to allow administrators to more easily manage features, such as internet-based services like E-mail or site hosting, or manage networks of Macs and Microsoft Windows PCs and provide services such as file and print sharing. Prior to Mac OS X, Apple's AppleShare software provided server applications such as file and printer sharing and user management.
Mac OS X Server leverages both open source technologies for provision of powerful standards-based services, and proprietary Apple applications for administration and for some additional services. Many services have aspects of both origins, such as Open Directory, which provides access to several open source (and external proprietary) technologies from one interface.
