More crushing of rivals
In other words, a browser that destroyed its competition by being offered for free may conceivably become available only by buying an expensive operating system. And a browser that has made its own tweaks into quasi-standards because it is universally available may now become the driving force for upgrading to new versions of Windows. The settlement of Microsoft's anti-trust case leaves it free to develop IE for Longhorn as it sees fit.
I dont think this will work anymore. Mozilla is a standards compliant browser that is opens source. No matter what Microsoft may try, I dont think they will be able to stop people from using third party browsers like Mozilla, Opera, and Konqueror/Safari. I dont think it matters anymore.