Charles Wang has been to E-mail hell, and returned to tell the tale. His journey there began innocently enough when, as chairman of Computer Associates International, a software company, he first heard how quickly his employees had embraced their new electronic-mail system. They were messaging one another like crazy. "I said, 'Wonderful,'" recalls Wang. "And I also said, 'Let's check into how people are using it.'"
But instead of a happily percolating E-mail culture, what had evolved was a behavioral nightmare. "It was a disaster," he says. "My managers were getting 200 to 300 E-mails a day each. People were so...