It was the same year that Bill Gates and Paul Allen co-founded Microsoft. In 1981, Bill Gates' company was hired to develop an operating system but rather than create a new operating system, they decided to purchase a pre-existing operating system called QDOS (Quick and Dirty Operating System). ) for the sum of $50,000. After modifying the operating system they purchased, they renamed it MS-DOS. After MS-DOS began to be sold, Gates generated a steady income, as the PC market was growing and there were not many competitors in the market. In 1986, when Microsoft Corporation went public, Gates became an overnight millionaire. The following year, Microsoft released its very first version of