By Ben Limberg BBC Money Programme

Two million e-mails are sent every minute in the UK. That is almost three billion each day. But what is the real cost of this information overload?

E-mail on the move adds to workers' stress levels

We can spend up to half our working day going through our inbox, leaving us tired, frustrated and unproductive.

A recent study found one-third of office workers suffer from e-mail stress.

And it is expensive, too. One FTSE firm estimated that dealing with pointless e-mails cost it £39m a year.