If you have lots of emails saved locally on your device and want to import them into Thunderbird, then the best solution is the Thunderbird importer tool. It is not only easy to use but also has various advanced features that allow the user to effortlessly save files in the Thunderbird email client.
However, there is a manual way to do this as well via the Thunderbird ImportExportTools NG solution, but that has lots of limitations, such as slow processing, corruption of large data, and even file-size restrictions. That is why experts always suggest the BitRecover Thunderbird Import tool. From dual file selection modes to auto-fetching the Thunderbird account, there are multiple high-tech features in this software that make it the best utility to bulk import data in Thunderbird with attachments, hierarchy, and other attributes.