The way this information is being released seems very shady. They don't mention what market they're analysing (US? Worldwide?), it's not clear how they could ag

The way this information is being released seems very shady. They don't mention what market they're analysing (US? Worldwide?), it's not clear how they could aggregate all sales information (which makers? does it count both corporate and consumer market? etc.), and they seem to be counting computers sold with Windows, when in many parts of the world PCs are sold without operating system but the users install Windows themselves. And so on. Too much noise, too little data.