According to IDC, e-mail addresses will increase by 138 per cent, from 505 million in 2002 to 1.2 billion in 2005. The study also predicted that the number of person-to-person e-mails sent on an average day is expected to exceed 36 billion worldwide in 2005.
The study said new web services, wireless devices and workers getting first-time e-mail addresses will contribute to this jump.
Employees who are untied from the office by portable computing devices are contributing to the increase.
"Workers such as deskless and mobile workers whose access to email has not come easy will benefit from customized e-mail software, devices, and hosted services," said Mark Levitt, research director for IDC's collaborative computing program, in a statement.