geijlsngi15 Research firm Gartner predicts about 271 million tablets will be shipped this year - only slightly less than its forecast of 277 million PCs and laptops - and Apple's iPad is currently the bestselling model.
Mr Nadella's predecessor, Steve Ballmer, launched an iPhone version of Office last year and confirmed an iPad version was in the works.
But many industry watchers have speculated that Mr Ballmer deliberately delayed its release in order to debut a tablet touch-centric version on Microsoft's own Surface machines before bringing it to a competing platform.
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