You can utilize Softaken PST to MBOX Converter. As it's a application created by Software that closes the dissatisfaction of PST to MBOX change. It can change over Outlook PST records to MBOX straightforwardly. Also, it has an easy to understand interface, extraordinarily worked for clients with no involvement in email transformation. There isn't anything that needs PST to MBOX Converter. It's great programming which you could utilize Refer:- https://www.softakensoftware.com/outlook-pst-converter.html
I might want to enlighten you concerning one of the good tools for importing PST Files to MBOX thunderbird The software name is eSoftTools PST to MBOX Converter Software It works quickly with basic advances. The tool can convert PST to MBOX thunderbird Close by each mailbox element like - messages, contact, schedule, attachments, task, notes, and others without changing the internal information. The apparatus is accessible with a free form preliminary that exports and migrates 25 emails of each folder. It upholds both ANSI and UNICODE PST. Keeps up email properties during the PST to MBOX conversion.
Read more:- Import PST file in Mozilla Thunderbird