E-mail became the Internet’s first killer app — and therein lies the problem. As software goes, e-mail is almost socialist: From each according to his ability, to each whether or not he needs it. …It doesn’t matter if the message comes from a spammer hawking Viagra, your wife asking you to pick up some wine, your boss telling the company that Monday is a holiday, or a client asking for a meeting at his office at 11 a.m. In today’s inboxes, all e-mail messages are equal. (Business 2.0)