i just want to point out, i don't care when microsoft was founded, the only reason microsoft exists as it does today is because IBM was producing hardware that MS wanted in on... MS could have never produced hardware, whereas Apple already was, which was why IBM decided to even make the hardware. They had misconceptions that the whole thing would be a failure, but that they needed to get their foots in the door anyway.
so you've got Apple, a company mostly run by a bunch of hippies, against IBM, a company that had existed for a century before and had already become a massive conglomerate. MS simply rode IBM to the top, while Apple knew that they needed to make both hardware and software---
now granted, in the 80's, Apple did get to be very large and dominating, and if things had turned out right, they'd be the ones with 90% marketshare. unfortunately for them (not for us, apple would be completely different) a string of mistakes ruled out any chance of that...
pnw