Every July, 400 of the most powerful media and tech industry...

Every July, 400 of the most powerful media and tech industry chieftains meet at investment banker Herb Allen's conference in Sun Valley, Idaho, for what are usually convivial discussions of megatrends and megamergers. But this year, Microsoft Chairman Bill Gates III laid into Sony Chief Executive Howard Stringer, according to two sources, including one who witnessed the exchange in a private room,