After loosing my email history to some failure associated with the Opera email client, I have not yet decided to attempt a recovery using Opera. If it happened once, it will happen again. I prefer Opera as a browser, but I have soured on its email client.
So, as I mentioned previously, I decided to implement Thunderbird as my primary email client. Thunderbird has some official status with Ubuntu in the sense that it is a part of the standard Ubuntu installation and they provide reliable...