As a related matter, I've found myself wondering why encrypted email has not become far more popular - or encrypted IM for that matter. I downloaded and installed PGPMail myself a few years back, but could never get any of my friends to install it as well. This strikes me as strange considering that I know that were I given a choice between an email client with encryption and without, I would choose the former. I assume most people would. So why hasn't this been offered as an automatic part of Outlook or Thunderbird? Why haven't market pressures led to this? Is it technical difficulties? Or is it something else?