Qroach said:
Jvd,
No, apple doesn't count as they don't develop an OS for PC hardware. If they did, then it'd be a different story. Btw, IBM contracted Microsoft to make DOS for thier PC architecture.
Yes, they didn't make a direct DOS competitor for IBM PC's but that doesn't mean jack. The point is that Apple was a direct competitor for the IBM PC itself in the home computer market in the first place, thus making it a competitor for MS too, everything else is just technicalities. If Apple had "won" and managed to further establish the Macintosh as the #1 personal computer (which was a much more real possibility then than it seems today), MS would have been screwed. BTW, MS didn't even develop DOS themselves, they bought it in its almost completed form.
Apple was on its way to becoming a corporate giant when MS still was in its shabby infancy and there was quite a deal of direct conflict involved in those roles reversing. It's actually a quite interesting story between the two (and IBM), you should go and pick up a good book about this whole area, there are a few good ones out there that provide a fascinating insight into what happened back in those days...