I used to buy Windows licenses, even multiple use family packs. And I would install them in Parallels on my Mac for testing IE. That works, until your Windows

I used to buy Windows licenses, even multiple use family packs. And I would install them in Parallels on my Mac for testing IE. That works, until your Windows keys start to expire. I guess I installed them too many times. Now my keys no longer work. So now I pirate copies of Windows that I have paid for, because it's too much hassle to work with the legitimate versions.