Import:
1] Open Thunderbird: Launch the Thunderbird email client on your computer.
2] Go to the Menu: Click on the three horizontal lines in the top-right corner to open the menu.
3] Select “Tools” / “Options” / “Preferences” Depending on your Thunderbird version, you'll find either “Tools”, "Options" or "Preferences" in the menu. Click on it.
4] After selecting “Tools”, the import option will come in the dropdown, select the option.
5] Select the import type as shown in the below picture and continue.
6] Select the profile/folder/file to import and continue.
Choose the file from the location and do the next.
7] Finally give confirmation to import the file.
Export:
- Launch Thunderbird.
- Select your Inbox or another folder.
- Select the email you want to export. Or press CTRL+A to select all emails.
- Click the menu button to display the Thunderbird menu.
- Select Save as > File.
- Select the folder where the emails should be saved and click Save.
For profile backup or profile export >>
1] Go to the Menu: Click on the three horizontal lines in the top-right corner to open the menu
2] Select "Tools" >> "Export"
3] Select the file location and then save it.