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PST Splitter Tool
If a user wants to convert PST to MBOX file format so I suggest professional software PST to MBOX Converter and the user are able to save data into a various file format like PST to EML, EMLX, MSG, HTML, and etc. PST migration allows checking the preview of mailbox data items & attachment before actual conversion is done. It supports all Windows versions like 10, 8, 7, XP.
VISIT HERE: https://www.kdetools.com/pst/mbox/