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I have frequently use free trial version of EmailsGuru PST to MBOX Converter. It is a seamless and efficient solution to convert Outlook PST files to MBOX format. With its user-friendly interface, batch conversion, selective conversion, folder hierarchy preservation, advanced search option, email properties maintenance, attachment conversion, compatibility with all Outlook versions, support for all MBOX email clients, and the ability to save converted files at a desired location and many features makers make it a must-have for users looking to convert an PST to MBOX file.