Looking back at Windows launches
A Harvard University dropout, Bill Gates co-founded Microsoft with Paul Allen in 1975. By 1980, he had licensed his MS-DOS operating system to IBM for its inaugural personal computer. Microsoft's Windows 95 computer operating system and Internet Explorer browser debuted in 1995 at the dawn of the Internet age. On Oct. 26, 2012, Microsoft releases its latest version of the operating system, Windows 8. Today, Gates is considered to be the world's richest private citizen with an estimated worth of 90 billion dollars.