The group of people that still hates Microsoft by and large will always hate them until they die. Even if they opened up the patents they'd still be hated for "being evil". There's next to nothing to gain from doing and there's billions to lose.
They're clearly trying to change their ways, but every now and then (i.e. patent crap) some of the old regime shines through. It shows that the internal mentality hasn't changed as much as they like to put on.
They need to walk the walk, which they're not doing. :(
This is exactly what I mean. Them opening up the patents wouldn't change your bias against their products (justified or otherwise isn't relevant) like you just described, making it a business decision with very, very limited gains and billions in losses.
By bias I meant that you flat out said that Windows and a few other MS products aren't worth the money and don't understand why anybody would use it. Now sure, it's possible that after careful consideration you decided in a completely unbiased manner that the products you listed aren't worth their cost under any circumstances but I'm sure you'll agree how that might sound incredibly biased to a casual observer.
edit: well except sharepoint like you said. That thing is just bad and I've no problem admitting to a bias against it.