It's not readily apparent that Apple or consumers have suffered, but the government claims that merely by attempting to divide up the market, MS has violated the antitrust laws. The government had claimed that MS had threatened Compaq when Apple had tried to get Compaq to distribute Apple's QuickTime. Apple reported that Compaq said that they were afraid of MS's reaction. Yeah, that's probably true, but the government hasn't made a solid claim on that assertion. I think it depends on whether Apple was trying to plug into MS' DirectShow architecture or trying to get Compaq to disavow the MS multimedia architecture.
Users benefit when different brands of PCs behave similarly.
Users suffer when they take their applications, data files, and web sites to a different PC and get a different experience. The government wants OEMs or users themselves to integrate software components even though most PC users probably are more than happy to use the PC the way it comes out of the box. Intel, RealNetworks, and Java Engstrom was also involved with Intel and RealNetworks. The government claims he tried to get Intel to stop working with Sun on Java and multimedia. That seems true, but his motivation seems to have been to promote MS software rather than to try to hurt Sun.