The Apple Macintosh operating system is called Mac OS X.
Apple's iChat software only works with their Macintosh computers and is not available for computers running the Windows operating system.
Yes, that is was the operating system of Macintosh Computers are called.
A Macintosh is a computer. Windows is an operating system. A Macintosh can run the Windows operating system. The question is meaningless.
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.
iMovie and Final Cut Express are applications created by Apple for their Macintosh range of computers and are not available for computers running the Windows operating system.
Apple Macintosh
Apple's Mac OS X is not available as a download and is only available for installation on Apple's Macintosh range of computers.
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.
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.
iMac, Mac Mini, Macbooks, and Hackintoshes.
Mac OS X Lion is Apple's latest revision of the popular software. It is available for download through the Apple Store for $29.99.
The Macintosh Operating System (OSX and variants) is only supported on Apple Macintosh computers. There are hacks which will allow MacOS to be installed and run on PC systems, but this is not supported and may be unstable.