How to export messages from Outlook 2003 to ThunderBird?

How to import messages to ThunderBird from Outlook 2003?

From my last experience I can say that the easiest way is to import/export this way:

Outlook 2003 -> Outlook Express – > Thunderbird

Next step could be using MozBackup application to make backup (export) database, eg for deploying on other machine.

 

Related links:

 

How to export messages from Outlook 2003 to Gmail?

Just use dedicated Google Application: Google Apps Migration for Microsoft Outlook

From my exprience – export of 250 000 messages took 7 days (no matter of the Internet connection speed).