Microsoft was there as an epiphenomenon. If they didn't exist (at all) the PC industry would still be here and some would argue that without the monopolistic innovation stifling practices, it would be much more vibrant today.
What? Correct me if I'm remembering incorrectly, but before Microsoft (and Compaq's IBM PC "compatibles") caused PCs to be commoditized, every computer-maker was trying to foist their own closed, proprietary walled garden onto the market. Instead of the PC revolution that created a common platform everywhere, we'd have a hundred small, fragmented, incompatible ecosystems fighting each other for market share. That just does not sound like it would allow for mass adoption through steep hardware price drops and the insane innovation that it enabled (which includes things like Linux). You might think the resultant situation as "vibrant", but I think the more appropriate word is "fragmented".
Citing you as a source, how was MS involved in the clones? Compaq made a clone of the IBM PC. The IBM PC was cloneable in the first place because they went extremely low budget and stuck together off the shelf parts. Yes, the cheap clone army definitely spurred the small computer revolution. But I don't see how MS can viewed as an entity that shepherded it along. They certainly weren't the only ones make a CPM clone either.
