Maybe you missed the Microsoft PR story about a user who switched from Mac to Windows. It was apparently a rebuttal to the popular Apple Switch Ads.
Until people found out it was falsified.
A great expose of the “switcher story” can be found here.
I like my Windows XP machines as much as anyone–I manage several hundred Wintel boxes at work. But why do you have to lie about a product to “prove” its worth? This is almost as bad as when Microsoft created fake political action committees to help sway views on the federal Justice Department vs. Microsoft. case.