I'm a bit confused on the 3 month requirement. First of all, I don't see where that is listed on Microsoft's website (I've looked through the main page, the "more about the program" page, and the FAQ. Second, assuming there is a 3 months requirement, is that three months since installation of the tool, or three months of total computer use since installation of the tool. I've heard people saying they'll leave their computer on for 3 months to complete the program, which presumably means that it is a 3 months of use total requirement, but again I don't see that on their website...