Export Outlook PST emails to the MBOX format using AxBlaze PST to MBOX converter which is available at an affordable price. There are several applications available but we recommend this solution because of its advanced features and conversion options. You can test the software free of cost. Download the free demo version, test it, and go for full conversion.
How to Convert PST to MBOX Without Outlook
The PST to MBOX Converter tool is safe and user-friendly tool to easily convert PST data to MBOX format. Read more about the software and reviews here https://thebestcomparisons.com/best-pst-to-mbox-converter-tools-reviews/
If you want to convert PST to MBOX without Outlook then you should try professional software. Try Magus PST to MBOX Converter. I was able to convert PST files to get the MBOX files in just few steps with this tool. Give it a try https://www.magustools.com/pst-conversion/mbox.php
Hope will works for you as well.
Many users want to convert OST to EML for free, but they do not have the best solution. Here I suggest downloading eSoftTools PST to MBOX converter software which is very easy to use because this software has the best GUI which makes access to this software eraser.
Read More: https://www.esofttools.com/blog/ost-to-eml-converter-free/