soften out the beer , MS - DOS turns 30 today . On July 27 , 1981 , Microsoft purchased QDOS from Seattle Computer Products . It was kind of a good muckle .

When IBM came to Microsoft asking for a 16 - moment operating system of rules , the company had to scramble to get one together . Rather than writing a new one from the ground up , it turned to Seattle Computer Products and its existing 86 - DOS ( aka QDOS ) , and grease one’s palms a non - exclusive license for $ 25,000 . The next Spring , in May 1981 , it engage by the program ’s author , programmerTim Paterson . And then , on July 27 , it paid another $ 50,000 for all rights . A month afterward , it was shipping on IBM personal computers , and eventually turned Bill Gates and Paul Allen into two of the world ’s richest man .

Just do n’t charge Paterson for Windows , okay ?

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