Sell companies something (product "A") at an outrageous price in Europe, and either

A) bundle XP with it physically.

B) Give the purchaser the ability to download XP from a US site after entering the registration number from product "A".

There's nothing that says you can't bundle your (monopoly) product as a 'free' bonus to be included with a product you DON'T have a monopoly on, after all.

And if this practice gets them hauled into court, well, that will take years to resolve too, with another fiscally insignifigant fine...