I direct you to the Microsoft trial.
In US law, if you have a monopoly in one area, using bundling to try to leverage that monopoly in another is anti-competitive. If you do not have a monopoly, then you're allowed to bundle to your heart's content in your quest for customers.
An economic note. If there are two competitors in the same space, one of whom bundles and the other of whom sells services individually, the predicted result is a disasterous price war between them until one or the other goes out of business.
Cheers,
Ben