coondoggie writes to tell us that in a recent study e-mail has overtaken telephony as the most common workplace communication tool. "Research reveals that 100% of the end-users surveyed use e-mail, followed by fixed-line telephones (80%), mobile telephones (76%) and instant messaging (66%). The study points out the three most ubiquitous technologies increase productivity the most. Over 70% of the end-users surveyed say e-mail impacts positively on their productivity, followed by conventional fixed-line telephony (53%) and mobile telephony (52%). From a productivity point-of-view, the research shows that instant messaging, blogs and softphones are considered most disruptive, and could negatively impact productivity if not managed properly."