Mac OS
You are referring to a computer operating system developed by Apple Inc.
The Macintosh operating system was created by Apple in 1984, which was incorporated into a computer called the Macintosh 128k. If you meant the first creators of the company Apple, then it would be Steve Jobs and Steve Wozniak.
Apple's Macintosh computers use Apple's operating system known as OSX. The current version is OSX 10.8.#. Macintosh computers can also run the Windows and Linux operating systems, but those systems are not included in the purchase of the computer.
Mac OS
Intel microprocessor-based computer running the Apple Macintosh operating system; Intel-Macintosh computer; IMac computer; iMac computer
Personal computer line developed and distributed by Apple, Inc. Macintosh computers have a specialized operating system, which differentiates from Microsoft's Windows operating system. McIntosh is also a last name and a kind of apple.
Apple Computer..now Apple Apple_Inc.introducedthe macintosh personal computer, with the Macintosh model, which came bundled with what was later renamed the Mac OS. but then known simply as the System Software
On January 24, 1984, Apple Computer, Inc. (now Apple Inc.) introduced the Apple Macintosh personal computer, with the Macintosh 128K model, which came bundled with the Mac OS operating system.
Windows is an operating system developed by Microsoft. Apple makes Macintosh computers that run Apple's own Mac OS X operating system but can also run the Windows operating system.
There is no Microsoft Apple. Microsoft is a company that produces software such as the operating system called Windows or the word processor Word. Apple is another company that makes the Macintosh range of computers which use Apple's own Mac OS X operating system. Both companies produce software that works on the other companies operating system. For example Microsoft produces a version of Word for the Macintosh and Apple has a version of iTunes that works on the Windows operating system.
The Macintosh Operating System (Mac OS) was created for, and is compatible with, Apple's Macintosh range of computers. As the Macintosh is a personal computer (PC) it can also run other operating systems such as Microsoft's Windows or various implementations of Linux.
The operating system used on Macintosh computers is written primarily by the programers at Apple. However they incorporate innovations from outside Apple such as 'Cover Flow' which were popular with Macintosh users. The original operating systems upon which the latest versions of the Apple operating system are based are 'NEXTSTEP/OPENSTEP.' and 'BSD,' which is a derivative of 'UNIX.'