There were a few utilities available pre-Snow Leopard which allowed you to set up the Mac’s built in Mail client in three columns.  Unfortunately all of them stopped working with the release of OS upgrade.

Letterbox is a small utility from Aarom Harnly.  It works with the built in Mac Mail client and allows you to view your mail application in three columns.  Aaron released a new beta last week that works with Snow Leopard.

In my opinion this little add-on makes the mail application look like it should be by default.  I’ve been using it for a little while and it’s been performing exactly as I’d expect, making my mail reading experience just a little easier.

Check out the app. here.

Now if someone would just fix Sticky Windows so it would work with Snow Leopard I’d be all set.

Related posts:

1. Apple to Release Snow Leopard on 08-Jun-09?
2. Resource: Snow Leopard Software Compatibility List
3. Snow Leopard Shipping Soon??
4. Snow Leopard Safe for iPhone Jailbreakers
5. Apple releases Snow Leopard performance upgrade