Some good points and I guess the answer is that I have no idea because this is a new product that doesn't have any current users or history to pull from. Also,

Some good points and I guess the answer is that I have no idea because this is a new product that doesn't have any current users or history to pull from. Also, one thing I just realized. With your comment and similar ones it seems like there is an assumption that users on IE 8 won't actually switch to another browser in order to access the site. I wonder what types of incentives would have to be in place to get someone to upgrade/change their browser.