Since Mac OS X is a UNIX operating system, can Mac OS X be used as a UNIX server?
Yes, but server tasks such as mail, file, print, and media servers would be more appropriate for Mac OS X Server. Any traditional UNIX server services, such as sendmail, apache, SAMBA, etc. can be run on Mac OS X. Most are even included, though they require UNIX knowledge for setup and configuration. However, these services and much more will be included with Mac OS X Server, all with easy-to-use graphical administration. See the Mac OS X Server Home Page for more information.