The year is 1997, and despite the machinations of its rivals, Microsoft is master of the digital universe and the darling of corporate America. Windows and Office generate staggering profits, the company's share price is stratospheric, and Bill Gates is the preeminent icon of the information age. No outsider could guess what Gates knew -- that the most powerful threat to Microsoft's prized Windows platform came not from Sun or Netscape or AOL or even...