Just a question really. I've always had a habit of keeping all the e-mails I send / receive at work, because if anything gets questioned, I can always refer to the saved mail etc.
I do this at home as well with my personal e-mails, but I don't know if it's necessary. I've got a habit of saving EVERYTHING, so I think I need to have a sort through, and get rid of any shite I don't need.