I remember back in the day the case against Microsoft looked huge too. I don't remember the details but it "felt like" Bush Jr got elected president and that whole thing went away.
There's a reason nobody remembers: the DoJ announced it was no longer seeking the breakup of Microsoft on September 6, 2001. A few days later, 9/11 occurred, and all other news was erased.
I'm not suggesting a conspiracy, by the way, just stating the facts.