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Export Messages to MBOX File for Outlook
This free utility exports email messages from Outlook to MBOX files, retaining the original folder structure. MBOX message database format is used by some mail systems for Unix, Linux, and Apple Macintosh. In addition, Mozilla Thunderbird and Eudora for Windows also use this format to store email messages.
This program quickly copies emails from Outlook to MBOX files. When doing this, the program creates the original Outlook folder structure on your disk or network share, and each folder can be stored in a separate MBOX file. Successfully exported messages can be deleted or moved to the specified Outlook folder. This allows you to run the export multiple times without creating duplicate messages.
The command line provides the ability to launch the utility in various scripts and batch files, for example, when you automate the migration of many Outlook and Exchange mailboxes to MBOX files.