People may find that "legacy application support" is the key thing here. I saw someone who had been contemplating an iPad3 get very excited about a Win7 tablet over the weekend. This person has no love for Microsoft products and even tried defecting to Linux and then a Mac. Has also been disapointed by PhoneOS versions of desktop Windows apps.
It's not the platform. It's the killer apps. People will put up with a platform they detest over that.