who did microsoft strike a deal with to provide dos operating system
History of Microsoft DOS (Disk Operating System) was the operating system that brought the company its real success. IBM first approached Microsoft about its upcoming IBM Personal Computer (IBM PC) in July 1980.[24] On August 12, 1981, after negotiations with Digital Research failed, IBM awarded a contract to Microsoft to provide a version of the CP/M operating system, which was set to be used in the IBM PC. For this deal, Microsoft purchased a CP/M clone called 86-DOS from Tim Paterson of Seattle Computer Products for less than US$100,000, which IBM renamed to IBM PC DOS. Microsoft did not have an operating system when they closed the deal with IBM and IBM had not done their homework. Due to potential copyright infringement problems with CP/M, IBM marketed both CP/M and PC DOS for US$240 and US$40, respectively, with PC DOS eventually becoming the standard because of its lower price.[25][26] 35 of the company's 100 employees worked on the IBM project for more than a year. When the IBM PC debuted, Microsoft was the only company that offered operating system, programming language, and application software for the new computer.[24]