The software name is eSoftTools PST to MBOX Converter Software if you find a solution for exporting emails from Outlook to MBOX. This works quickly and easily. It's simple to convert PST files to MBOX. This software is compatible with all Windows editions, including 10, 8.1, 8, 7, Vista, XP, and all previous editions, and it offers live previews during the conversion of PST to MBOX. All users have access to the demo version. You can convert up to 25 emails per folder for more efficient checking.