Twenty years ago isn't "recent history" for anything in the tech industry. People who were at Microsoft back when they were "really evil" in the 90s have since WORKED AT GOOGLE (or any number of other companies you might be a fan of), and even left Google, since then.
Very few people who made decisions you may be holding over them today, actually work at Microsoft today. You can legitimately hold a decision against a person for a long time... they're still the same person, more than likely. But a company is an amalgamation of it's employees. And employees come and go.