"You are currently using 901 MB (11 %) of your 7573 MB."
I do not go crazy on my e-mail. Granted, I've had this longer than Levy had had his, at the time, but 1 GB does not seem crazy to me.
At work we have people who use PST files and some of them are over 30GB. The primary reason is all the pdf attachments they pass around when scanning important documents.
My mailbox does not have loads of attachments, but I suspect that's where most of the space is used up. I also have a few dev mailing lists which just dump e-mails in at a regular rate. dev@apache, for one, has tons of e-mails of which many contain patches. So I suspect a lot is in there.
I understand Bill's confusion but it's all about non-personal mailing lists and attachments.