RAID is not a replacement for a backup! Here's why.
Just an idea - but wouldn't it be a good feature to have a built in email archive technology? MailStor (purely as one product I personally like), is really good.
Just a thought.... what do others think?
I'll move this to the Idea Exchange Lounge for you.
Pesonally I don't think it should be apart of the interface. Saving your email on a mail server like yahoo or gmail should be sufficiant. At least for me.