From Squashed Software:
Email Backup Pro is an easy to use, powerful, automated email backup solution. It allows for scheduled backups of the most common email applications through the configuration of a simple interface. Once configured, Email Backup Pro will automatically backup up your email data to the specified destination. The destination can be any mountable volume - including server volumes. Email Backup Pro has support for the major email applications - Apple Mail, Microsoft Entourage v.X, 2004 and 2008, Eudora 6 and 8, Thunderbird 2 and 3, Postbox 1 and 2, GyazMail and Mailsmith. Newly added Microsoft Outlook 2011 support. Email Backup Pro supports Entourage/Outlook in multiple languages including: English, Italian, Dutch, German, French and Spanish.
What's new in this version:
This update includes improved support for 10.8.