Interesting excerpt from this NYT article: Delete: Bathwater. Undelete: Baby. (free registration might be required… if you don’t want to sign up, try bugmenot for a username and password).

Three billion messages a day arrive at the computers that run Hotmail, a Microsoft service with 170 million subscribers. The service blocks 2.7 billion of those messages, said George Webb, business manager for Microsoft’s anti-spam technology and strategy group.

Stunning, huh? Who responds to spam, anyway? Why is it still profitable?