One overall problem for the government is that after all the e-mail smoke clears, the government has to show where the consumer injury is. It can't just look like the competition has been hurt.
I think Microsoft has been a very difficult client. They've made it harder for their lawyers to exercise professional judgment where the case might go because they've been very dogged about standing firm.
The old story in antitrust cases is that the government wins the battle and loses the war. The question is: What do you get in relief?