From Heinz Tschabitscher,
Your Guide to Email.
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A. According to a Radicati Group study from October 2007, there are about 1.2 billion email users worldwide. That makes a tad more than one in every six persons on the earth use email.

The mailboxes commanded by these millions of users were estimated to number about 1.4 billion in 2006.

Corporate Users

The Radicati Group counted 516 million business email inboxes worldwide in 2007.

Naturally, all numbers are educated guesses. I don't know the exact methods used to arrive at them. Still, they are probably more educated a guess than most of us can make.

How Many Emails?

The millions of email users send hundreds of billions of messages every day.