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Microsoft Operating Systems An operating system (OS) is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is a vital component of the system software in a computer system. Application programs require an operating system which are usually separate programs, but can be combined in simple systems. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between application programs and the computer hardware. Operating systems are found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers. Operating Systems join all devices and software together No O.S. No Functionality Operating System Types / Categories PC – Personal Computers MAC – Macintosh / Apple Computers DOS (Command Line) Mac OS System (1) Single Task WIN 3.1(GUI) System Software 2 WIN 95 System Software 3 WIN 98 System Software 4 WIN 98 SE System Software 5 – Multi Task (Multi Finder) WIN ME System Software 6 WIN NT System Software 7 WIN 2000 Mac OS 7.6 WIN XP Mac OS 8 WIN VISTA MAC OS 9 WIN 7 MAC OS X (CHEETAH – MOUNTAIN LION) BETA P.C. O.S. History Resource Link http://en.wikipedia.org/wiki/History_of_Microsoft_Windows Mac O.S. History Resource Link http://en.wikipedia.org/wiki/History_of_Mac_OS http://en.wikipedia.org/wiki/OS_X