My parents have been on holiday for several weeks, and I have been checking Dad's email for him etc. I have been using Mail, I set up his account and it's all been working fine. Now, Mum and Dad get back tonight, so I need to transfer all of Dad's email into his Windows Outlook Express. I can't find an Export option anywhere, and dragging messages from Mail into a Finder window doesn't work (this works with Outlook Express). How can I transfer the messages?