If you are looking for a method to import PST files to Thunderbird, then you can use EmailProHelp PST Migration Tool. It easily export PST email files to multiple formats, including PST, MBOX, EML, EMLX, and MSG. Additionally, it facilitates direct PST file import into various cloud and desktop email clients such as Office 365, Gmail, Yahoo, Thunderbird, AOL, Hotmail, Zoho, IMAP, Yandex, and iCloud. For data archival and accessibility, the tool enables PST file backup to diverse formats like PDF, CSV, GIF, JPG, TIFF, HTML, MHTML, PNG, DOC, DOCX, DOCM, VCF, and ICS. Notable features include the ability to process multiple files simultaneously, eliminate duplicate emails, and ensure high compatibility with various PST file versions. It fully supports all Windows operating systems.