Neither Windows nor IE need to be a monopoly for this to be illegal. The illegality comes from Microsoft using the market share of Windows to block competition in the web browser market. This bundling is anti-competitive behavior.
As a comparison, users who have flashed the most recent CM7 nightly on the nook color have seen quadrant scores in excess of 2000; nearly double that of a G Tab. Also, CM7 gives working (although not very well) bluetooth.