Why does it matter?
None of them actually charge for the browser? It's free!
On the point of giving users a choice, the ones that choose a browser different to IE would install it anyway. The others would just go with IE surely since they've bought a Microsoft operating system?
And as has been mentioned Apple are just as bad. I've recently moved to OS X and while I do enjoy it I also can't believe they get away with tying in the need for Safari. For those that say you can delete it, unfortunately some of the settings for OS X rely upon what you set in Safari. That makes it even worse than IE surely?
It's just all fanboyism at the end of the day!
From an Opera fan. I even bought it back when you had to pay for it.