Hi, it is highly recommended to use the well-known and trusted solution to convert PST to MBOX file format. You can try one of the best Outlook PST file converter (https://www.data-recovery-solutions.com/outlook-pst-file-converter.php) tool available in the market. The automated third-party solution can easily export PST files to MBOX, EML, EMLX, PDF, etc. The free version allows exporting 50 emails for free. ‎

EDB to PST Converter Software is a complete solution for  recovering and extracting exchange mailboxes to Outlook PST files, convert edb to pst instantly. You can now recover mailboxes from mounted EDB files data with this EDB to PST tool. This EDB to PST Conversion software to recover EDB to PST is widely scans the edb file and recovers the entire mailbox listed in a selected EDB file. It can recover emails, contacts, journals, and permanently deleted emails, notes, sent emails, drafted emails, appointments, alarms, and schedules to Outlook PST files. See more information at: https://softcart.wordpress.com/edb-to-pst-converter/

You can convert your normal or corrupt PST file to EML file with the PST to EML converter and manual method. But if you want to solve the PST file error and convert it to EML format in technical terms then visit here: Best solution of PST to EML Conversion. From here you will learn the different free manual methods for the conversion of PST to EML.