1984, I believe. It was the first operating system with a Graphical User Interface (GUI), aside from the Apple Lisa, which was a commercial failure. The technology was bought or borrowed from Xerox.
Note: A graphical user interface is an interface with the mouses, buttons, desktop, icons, etc., like most computers are, nowadays. Before that, you had to use DOS (Disk Operating System), which consisted of primarily typing and reading words, very few nice pictures.
Although the operating system was strictly only black and white colors, it was quite a revolution in computing.
Mac OS Leopard
yes
The Mac OS was designed by Apple as the operating system for their Macintosh range of computers. The first Mac OS, originally known as System Software, was introduced with the first Macintosh in 1984. Over the years the original Mac OS was developed, improved and expanded until Mac OS 9 in 2001. For version 10 Apple reworked the Mac OS around a UNIX core and this is known as Mac OS X.
the Mac Os X 10.000 will come out this summer/fall (about). it will be called Lion.
Boxed versions of Mac OS X do not include the iLife suite which is available separately.
Mac OS is the first operating system developed in the year 1955
Mac OS X was first released as Mac OS X Server 1.0 in 1999 and the first standard version Mac OS X v10.0 "Cheetah" arrived on March 24, 2001.
Mac OS 8.1 was released on January 19, 1998.
Mac OS X (say Mac OS Ten) is the tenth version of the operating system (OS) that controls a Macintosh computer (known as a Mac for short). The equivalent for some other computers would be the Windows operating system. Mac OS X has been around for nearly ten years and replaced Mac OS 9 which was the last version of what is known as the "classic" Mac OS. Although a few Macs still use Mac OS 9 all Macs sold since 2002 have come with Mac OS X and would now be considered a regular Mac. (See links below)
All new Macs are supplied with the latest version of Mac OS X which is currently 10.6 Snow Leopard.
The Photobooth software requires Mac OS X 10.5 (Leopard) or higher and is not available for Mac OS X 10.4 (Tiger).
The main OS for Mac can be found on a Mac when it is switched on. The current main OS is called Mac OS X.