Who does Microsoft hate the most?

Wow! Now that really is a hard question to answer isn't it? If you listen to what 'Barmy' Steve Ballmer, Microsoft CEO and 43rd richest person on Earth, has to say then you might be forgiven for thinking it is Google (I'm going to f****** kill Google), or maybe Apple (I've got my kids brainwashed... you don't use an iPod) or even Linux (... a cancer that attaches itself in an intellectual property sense to everything it touches.)