Office is designed to inputting with a keyboard, not a stylus or a finger,” the official says. “There were all kinds of personal prejudices at work.” According to Microsoft executives, the company’s loyalty to Windows and Office repeatedly kept them from jumping on emerging technologies. “Windows was the god—everything had to work with Windows,” Stone tells Eichenwald. “Ideas about mobile computing with a user experience that was cleaner than with a P.C. were deemed unimportant by a few powerful people in that division, and they managed to kill the effort.