1) Microsoft has been found to have a monopoly on the "desktop" market, that is, the machines most commonly used to browse the internet.
2) Microsoft has bundled a browser into said desktop monopoly product.
3) Microsoft now disallows other browsers - the most likely competition, by _name alone_ from receiving data from their MSN ISP pages, thus disallowing competing product use.

Monopoly leveraging. Big, Bold, Unchanged from what they got convicted for.

Addison