Download and Install Advik MBOX to TXT Converter software in your PC. This utility will export MBOX emails to plain text format. You can convert multiple mailbox files into .txt files.
Try it for FREE: https://www.adviksoft.com/mbox/txt.html
Steps to convert MBOX to Plain Text files;
1. Run Advik MBOX to TXT Converter in your PC.
2. Click Add File and load .mbox file into software.
3. Now choose Text as saving option from the list.
4. Click Convert button.
Done! The software will convert MBOX to Text files with attachments. Thus, no data loss will occur.