Looking into this more, I see that Lotus 1-2-3 is considered to have greatly helped the IBM PC become dominant, and it did not run on CP/M-86 (i would be interested in any confirmation or rebuttal of this though). So Microsoft's success was partially due to Lotus as well as IBM, both of whom they would defeat in PC OSes and spreadsheets. There was rumored to be a saying at MS "DOS isn't done until Lotus won't run".....And Mitch Kapor ended up promoting free software (was head of Mozilla) and tech inclusion with his foundation.