http://www.uslsoftware.com - Mail Extractor Pro works Mac. It converts your emails to PST file format from multiple sources including Apple Mail, Thunderbird, Postbox etc. Also support all generic *.MBOX file conversion. The tool convert each email very carefully that you will get exact copy of your Mail Database. Migrate each and every items from your emails (Images, To, BCC, CC, Attachments etc). Safe and secure tool for email migration.