If you are specially looking for to convert PST file to MBOX then I would recommend to use
EmailsGuru PST to MBOX Converter. It allow users to convert PST file to MBOX, maintaining the original folder structure and preserves the email metadata during the conversion. The converted MBOX file data can be easily accessible to all major email clients like Mozilla Thunderbird, Yahoo Mail, Opera Mail, Apple Mail and many others. It supports all versions of Microsoft Outlook and MBOX clients. It is Windows based solition offering a free trial version to users.
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