You should take help this professional PST to MBOX Converter Software to easily and instantly convert multiple and single PST files to MBOX format with all attachments. This has many following features which help the users to know more about this software. This software is 100% safe and secure which maintain the folder hierarchy intact during conversion. It also able to convert encrypted pst file into mbox format even if outlook pst file is password protected. Use it free demo version to get more information about functionality and can see the preview of all convertible data.
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Now transfer all the PST files of Outlook into MBOX format with the help of the great PST to MBOX converter utility. With this software, a user can easily export the PST files to other file formats. The application supports bulk migraton hence, a user can move the PST files to MBOX format in bulk quantity. Refer:- http://www.softwaretoconvert.com/pst-to-mbox/
I will suggest you try manual techniques to instrument conversion of PST data to MBOX instead of using any third-party PST to MBOX Converter Tool. PST to MBOX Software who switch PST files as well as migrate PST to MBOX file.
Read more: https://www.sametools.com/convert/pst/