Zonie.. you don't know that bribery actually takes place; though a very popular theme.
I'm too lazy to find links at the moment, but if you want I'll look the info up for you. It's all done legally, and the relevant information is publicly available. Microsoft transfers large funds to organisations like the BSA, which in turn sponor the election campaigns of various senators. In the eyes of the law, it's not a bribe. In reality, Senators have a weird tendancy to push laws which favour the corporations who sponsor them.