Few simple steps helps you to import MBOX files in Mozilla Thunderbird. Follow few setups and import *.mbox files in thunderbird easily.
First of all you need an add-on for Thunderbird. Download it from here and install it with Thunderbird application https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/
Click on Tools and then Add-on
Then search your Add-on Name
You can also manually download addon File and import it easily by using below option
Now Click on "Add to Thunderbird" Button
Now Click on Add and then Restart
After doing this click on Tools from menu or right click on any folder and select import MBOX file option
And choose “Import directly one or more mbox files”
And easily choose your desired MBOX file for Thunderbird
If you are not able to install any addon in Thunderbird new version then you will get "could not be installed because it is not compatible with Thunderbird" error message.
Thunderbird development experts provided an option to opt-out of the strict extension compatible checking enforcement. While that does not necessarily mean that extensions will work if they are not listed as compatible, chance is good that they do if they have been updated recently.
Step:1 First you need to open Thunderbird
Step:2 Click on Tools and then Option
Step:3 Switch to Advance Tab
Step:4 Click on the Config Editor button under General
Step:5 Confirm that you will be careful.
Step:6 Search for extensions.strictCompatibility.
Step:7 Double-click on the preference and make it false
If you are getting Impossibile to Import in this folder (imap or newsgroup type) error message then select Local Folder and then import