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If you want to preview PST and MBOX file contents, you can download the free version of the PST and MBOX conversion tool. You can check all the mail contents with attachments, embedded items, and header details.
For PST file (Download free version): https://www.axblaze.com/products/psttombox-converter.html
For MBOX file (Download free version): https://www.axblaze.com/products/mboxtopst-converter.html