Exporting EML files to PST file format is a requirement for those users who want to export their emails from multiple email applications to Microsoft Outlook. The email applications, such as Mozilla Thunderbird, Outlook Express, Windows Live Mail, or any other email client, export emails in EML file format. https://medium.com/@jyotimailsdaddy/how-to-export-eml-files-from-different-email-clients-to-pst-7b73f30103c3