This is what happens when you don't have an appropriate retention policy:

A little browsing and up pops a piece of e-mail from an Enron employee complaining about a mother-in-law: "the most selfish person on Earth." Another contains decades-old photos of former chief executive Jeffrey K. Skilling, sent him by his Beta Theta Pi fraternity brothers. A piece of e-mail written by a woman in Portland, Ore., asks an Enron energy trader, "So ... you were looking for a one night stand after all ...?"

The complete database is here. Don't let this happen to you!