Microsoft CEO Satya Nadella Announces Office Apps for iPad - Businessweek

The article also notes that Microsoft has found a way to avoid paying Apple a cut of its full iOS app licensing revenue

"A new version of Office software is the kind of announcement that’s hard to make sexy. Still, Microsoft did its best, showing off a bunch of features that were clearly designed for the tablet, including a custom numeric keyboard for Excel and a faux laser pointer for PowerPoint. The apps had been in the works for at least three years, says Ted Schadler, an analyst at Forrester Research who saw earlier stages of development. “The timing is evidence that Nadella said let’s go, but he couldn’t say let’s go unless they had a product,” according to Schadler."

Microsoft CEO Satya Nadella Announces Office Apps for iPad - Businessweek