One year after Microsoft launched its tablet PC operating system, sales have been disappointing, the choice of models is still poor, and software developers have no incentive to create specialist applications, according to a report by research firm Canalys.

HP, Acer and Toshiba launched tablet-PC hardware at the same time that Microsoft launched its Windows XP Tablet PC Edition, but after a promising start, sales have fallen sharply with analysts and manufacturers blaming Microsoft for charging too much for its operating system.

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