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 from the U.S. Department of Justice, but from within the company's own ranks. Breaking Windows tells the story of the battle for the soul of Microsoft that raged inside the company from 1997 to 2000 and continues to reverberate today. Drawing on hundreds of e-mails among Microsoft executives, trial testimony, and exclusive interviews with Gates and his chief lieutenants, Wall Street Journal reporter David Bank reveals the bitter maneuvering between what he calls Microsoft's "Windows hawks" and its "Internet doves." On...