This is so anti-competitive. They are essentially creating one massive borg bundle. So if you need to buy three things from the bundle (Windows, AD, etc), the incremental price of adding the next product is going to be less costly than any stand alone solution.... and then after they have everyone on their giant bundle, I'm sure there is no way you can extract yourself as you will have to pay the same price for the entire borg even if you don't want one of the products.
I'm sure they are doing this purely to stop Google (in productivity) and Apple, Google, Linux in end user OSs from picking off their customers. There are many companies out there that want Google G Suite, but also want Windows... or use Macs, but also want Office. They are attempting to say "if you want Windows... you're welcome to buy G Suite, but we are going to double your Windows prices if you don't buy the bundle... so give it a think."
Come on, EU. You enjoy going after American tech companies. Here is finally a situation where they have it coming.