Enter Letterbox.

I’ve actually been using this software for a while now and, it has to be said, it is super. It allows you to view your email in 3 columns similar to Outlook, with your folders on the left, inbox in the middle and the mail previews on the right.

I can’t tell you how much nicer this makes the Apple Mail app. I would recommend everybody downloads this tool immediately. Well.... go on then!

You can download Letterbox for free at http://harnly.net/software/letterbox/