Nope, IBM did not invent the PC
Sorry, but IBM had to be hauled kicking and screaming into the minicomputer marketplace. The PC was actually invented by a guy on his table top at home. He managed to get Radio Shack (Tandy Corporation) to sell the first ones.
When IBM decided to join the fray, the went to Gates for an O/S and Gates bought a CP/M rip-off from its developer for peanuts.
Since IBM gave Gates his start, and Microsoft licensing is still modeled on the IBM licensing strategy from that period, I'm amazed that Microsoft is trying to FUD their own methodology. I mean, amazed they think they can do so with any credibility.