If you want an easy approach to convert PST files to EML format I recommend
TrustVare PST to EML Converter Software. It makes the process simple, even for non technical users. The application instantly imports your Outlook PST file, examines all emails and mailbox folders, then converts them to EML format with no data loss. During the conversion process, it keeps the email and attachments. The interface is simple to use offers batch conversion, and is compatible with all versions of Windows and MS Outlook. It makes it a perfect choice for anyone in need of fast PST to EML conversion.
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https://www.trustvare.com/pst/eml/