Osama bin Laden was a prolific email writer who kept one step ahead of the US government's best eavesdroppers - despite having no internet access in his hideout.
His methods served him well for years and frustrated Western efforts to trace him through cyberspace. The arrangement allowed bin Laden to stay in touch worldwide without leaving any digital fingerprints behind.
Is the world a safer place now Osama bin Laden is dead? Here is the latest selection of Your Views: