Mac OS X [1] is a line of graphical operating systems developed, marketed, and sold by Apple Inc, the latest of which is pre-loaded on all currently shipping Macintosh computers. Mac OS X is the successor to the original Mac OS, which had been Apple's primary operating system since 1984. Mac OS X is a Unix-based operating system[2] built on technology that had been developed at NeXT through the second half of the 1980s until Apple purchased the company in early 1997. OS X was not the first version of Unix that Apple had sold. Apple had, in fact offered a Unix-based operating system earlier than OS X, called A/UX since the late 80's. Over time, A/UX developed a Mac OS looking user interface, but was never seriously marketed.
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| Mac OS X branch | ||
| Preceded by System 7 |
Mac OS X | Followed by --- |
| Nextstep branch | ||
| Preceded by Nextstep |
Mac OS X | Followed by --- |
| Word 2008 branch | ||
| Influenced by --- |
Mac OS X | Influenced Word 2000 |