"The simple argument that 'this is good enough for 90 percent of what we do' has fallen on its face over and over and over again," Leblond told Reuters in an interview on Tuesday. "When it comes to mission critical things and key pieces of how people run their businesses, the threshold is higher."

Leblond and Kurt DelBene took over the Office group after Steven Sinofsky left to head up the Windows team. Leblond oversees what he calls "old school" applications like Word, Excel and PowerPoint, while DelBene oversees the new SharePoint Web collaboration software and other server-based programs.

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