PST data files are not natively supported by email clients such as Thunderbird, Apple Mail, Entourage, and other MBOX-based applications. MailsDaddy PST to MBOX Converter tool enables organizations to load and transfer data from the PST format to the MBOX format in a single operation. This software is compatible with all versions of the Windows operating system and Microsoft Outlook; it can even export corrupted PST files into MBOX format. Additionally, it offers various other conversion options, including EML, MSG, HTML, PDF, MHTML, and RTF. The trial version of the software allows for the upload of multiple PST files and the export of 20 items from each folder.

more detail: www.mailsdaddy.com/pst-file-converter/