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.
And it is expensive, too. One FTSE firm estimated that dealing with pointless e-mails cost it £39m a year.
A recent study found one-third of office workers suffer from e-mail stress.