Tools -> ImportExportTools -> Import Messages and "Import all messages from a directory" import .eml files. That is mainly used to import messages from other email clients that don't support mbox files such as Windows Live Mail. Thunderbird does support configuring an account to use maildir rather than mbox to store messages. Thunderbird's implementation of maildir stores all of the messages ...
https://www.groovypost.com/howto/migrate-apple-mail-windows-10/ https://www.mboxtooutlook.org/blog/backup-and-convert-thunderbird-emails-to-pst.html https://thatnetsite.com/2009/06/export-mail-from-thunderbird-to-outlook-2007/ https://www.thunderbird-mail.de/lexicon/entry/199-importexporttools-mbox-dateien-importieren/ http://codex.wordpress.org.cn/Importing_and_exporting_your_mail http://vahupyz.hotesavent.ru.net/?jab=import-export-tool-thunderbird-2521527884
ImportExportTools - Free Shell Provider on Debian/GNU Linux ImportExportTools allows the user to export and import messages with more flexibility, with the following options: Tools Menu --> ImportExportTools Context menu on folders panel --> Import/Export - export of folder in a single file (mbox format), with als ... ImportExportTools - Importer Exporter classeurs et messages ... Modules pour Thunderbird : ... (menu contextuel) sur un dossier dans le panneau dossiers (panneau de gauche)) > Import / Export. Vous permet : L'exportation de dossiers dans un seul fichier (format mbox), avec également les sous-dossiers, si vous voulez ... Thunderbirdでデータを移行する方法 | IT底辺脱却ブログ ThunderbirdのアドオンImportExportToolsを使います。 ImportExportToolsのインストール ひと昔前まではアドオンをサイトからダウンロードしてきてインストールするという方法でしたが、今はThunderbird上からアドオンを検索できるようになっています。
http://tundragraphics.com/blog/2015/10/excellent-adventures-in-email-archiving-part-2-mbox-to-thunderbird/ https://www.catasoftware.com/thunderbird-converter/ https://www.lettolearn.com/how-to-open-mbox-file-outlook/ http://www.thunderbirdconverter.com/ https://www.bleepingcomputer.com/forums/t/614690/importing-mbox-file-in-thunderbird-gives-only-empty-local-subdirectories-without/ https://spinbackup.com/blog/how-to-import-mbox-to-gmail/
Tools Menu --> ImportExportTools or Context menu on folders panel --> Import/Export - export of folder in a single file (mbox format), with also the subfolders if you want; - export of all messages in single files (eml or html or plain text…
http://tundragraphics.com/blog/2015/10/excellent-adventures-in-email-archiving-part-2-mbox-to-thunderbird/ https://www.catasoftware.com/thunderbird-converter/ https://www.lettolearn.com/how-to-open-mbox-file-outlook/ http://www.thunderbirdconverter.com/ https://www.bleepingcomputer.com/forums/t/614690/importing-mbox-file-in-thunderbird-gives-only-empty-local-subdirectories-without/ https://spinbackup.com/blog/how-to-import-mbox-to-gmail/ https://www.updatesinsider.com/microsoft/outlook/outlook-to-thunderbird-migration/