In 2004, Bill Gates claimed that it would take two years to solve the problem of spam e-mail.

FORBES: Magazine Article

Before libraries and publishers can come together and agree how to solve the problem of library e-book lending, they probably will have to understand each other.

FORBES: What Is Going On With Library E-Book Lending?

Mr Gates suggested that new techniques to identify senders, or the imposition of a small fee to send e-mails, might solve the problem.

ECONOMIST: Unwanted e-mails are no longer the menace they once were