Yeah, it started its life as “Quick And Dirty Operating System” (don’t know, why they renamed it) and even that was basically a ripoff of CP/M: https://en.wikipedia.org/wiki/86-DOS

I guess, you can say that they did put in own effort into developing the windowing system. I wouldn’t want to call that “innovating”, since they were late to the party, but I guess, that would be moving the goal posts here…