| Its debut product was of course CP/M, which was destroyed by Microsoft (at that time, Microsoft was Bill Gates). It eventually gained some market share with DR-DOS, which was also killed by Microsoft (by continually tinkering with Windows and MS-DOS to keep it from running under DR-DOS. This resulted in a recently-settled lawsuit).
Gary Kildall in fact died of complications from falling off a ladder or a roof, as I recall. | 
