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I keep the e-mails which I might need to refer to in the future in by inbox still.
Other than that, I always delete the ones I've already read, and the ones that I know are spam.
I do have to if it's from things like Facebook, i get quite annoyed at that, but actually i have a lot of important emails that hold top secret things in :D
Sometimes I do, and when I'm looking for a certain email I will.
Other than that though, I rarely do it. XD I sometimes organize emails from specific senders though, so it's not as bad as just piling them altogether in one folder.
I delete any spam and facebook notifications right away, but otherwise I have a bad tendency to just let things set. D: I try to keep it organized with folders, though.