Analysis of Windows Operating System and Microsoft What is Windows? Windows is a personal computer operating system from Microsoft that, together with some commonly used business applications such as Microsoft PowerPoint, Word and Excel, has become a de facto â€œstandardâ€� for individual users in most corporations as well as in most homes. It provides a graphical user interface (GUI), virtual memory management, multitasking, and support for many peripheral devices. According to OneStat.com, as of August, 2006, Windows as a whole dominates the personal computer world, running on about 97% of the operating system market share, with XP accounting for about 87% of that. In comparison Mac OS has about 2% and Linux (with all distributions) about .36% The reason why this is so is mainly because Windows is much more user friendly and everything comes pre-packaged so user just have to run the application and follow instructions for it to install. There are many versions of Windows Operating System available namely: Windows 286 Windows 386 Windows 3.0 and 3.