Let's skip over the hilarious hyperbole of comparing a business story to the prosecution of aggressive war (yes, managers love to *talk* about "crushing" opposition and evisceration and all that...all of which is hilarious hyperbole, too).
Taking it at face value - Japan had its whole regime torn down, warmongers mostly shot for war crimes, replaced with a whole different government and became a whole different culture that now votes heavily against any significant degree of aggressive militarization. If MS had *lost* that antitrust case and been broken up, managers scattered, their whole corporate culture changed, that would have been equivalent.
It wasn't just one thing - attempting to monopolize web browsers and make MS products the default choice for any web application was only a part of it. It was MS wanting to see all your product designs under non-disclosure before they'd offer to buy your company...and then the offer would be comically low and if you didn't take it, your general ideas would appear (badly) in a new Microsoft product that automatically took all your market share because...it was Microsoft.
Columnist "Robert X. Cringely" had a good term for it: "sharp trading" - always on the edge of illegal, but hard and expensive to prove as such. Nobody does business with the sharp trader twice....unless they're over a barrel.
Microsoft's *power* to do this has been reduced, but not their business model and inclinations. I have no choice but to use Office at work, and so I'm an enthused Excel VBA programmer, you make the best of what you've got. (And besides, writing a large critical application as a glorified spreadsheet macro is rare; it's just great for one-shot solutions.) But the very idea of basing a larger business system around SharePoint, their various Visual programming languages, their C# ripoff of Java, strikes me as comical; I'd go with platforms they don't control every time. MS has a long and continuing history of using their most-deeply-engaged customers the way shepherds use sheep - by which I mean "keep shearing them every year" of course. Honest.