OS X (pronounced O, ES, TEN – as in Roman numeral X) is version 10 of the Apple Macintosh operating system (OS). This new (as of this writing) operating system has been described by Apple as its first “complete revision” of the Mac OS (the previous version was OS 9) and incorporates support for UNIX-based applications as well as for those written just for the Macintosh. There are many major enhancements and paradigm shifts associated with OS X (too many to list here), many of which have yet to be fully realized at the time of this writing. More information and continual updates about OS X can be found at Apple’s website or you can search the inSync archives for updated entries.