Comment Inertia (Score 1) 1880
Seriously... i haven't seen a compelling push to change otherwise.
All linux distros have software that act like Word, iTunes, and Photoshop, but I already have that software here and it's ready to use. Why would I switch?
I used to be an Ubuntu user full time in college but then had to deal with work and other people; it's just easier to use Windows. I'm sure things have evolved tremendously since I used it but I don't see the draw to pull me back in.
(Ubuntu's Unity GUI does look beautiful though.