The threat of someone looking through ancient emails aside, there really is no reason not to store old messages forever. They're incredibly small, and you neve

The threat of someone looking through ancient emails aside, there really is no reason not to store old messages forever. They're incredibly small, and you never know when you'll want to reference an old discussion because someone comes back into your life. In the bad old days before archiving, people got in the habit of deleting emails because there was no better way to get them out of the inbox.