It is simple .mbox file viewer for the Mac. You can finally open .mbox files without messing up your email client.
It will also help you migrate the emails in the .mbox file to any IMAP supported email account. If you have old .mbox files lying around, this will help you make use of it.
This was born out of a brainstorming session with the ever so awesome Matthew Waite. Thanks for the amazing feedback.