IBM licensed and re-released it in 1981 as PC DOS 1.0 for use in its PCs. MS-DOS was the main operating system for IBM PC compatibles during the 1980s, from which point it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the graphical Microsoft Windows operating system. Collectively, MS-DOS, its rebranding as IBM PC DOS, and a few operating systems attempting to be compatible with MS-DOS, are sometimes referred to as 'DOS' (which is also the generic acronym for disk operating system). MS-DOS ( / ˌ ɛ m ˌ ɛ s ˈ d ɒ s/ em-es- DOSS acronym for Microsoft Disk Operating System, also known as Microsoft DOS) is an operating system for x86-based personal computers mostly developed by Microsoft. MS-DOS versions 1x-7.0 unsupported as of Decem MS-DOS versions 7.10 and 8.0 unsupported as of July 11, 2006.
