3 Ways to Fix Thunderbird ImportExportTools NG is Not Working

Published On - December 13, 2023 by Nasir Khan |

Reading Time: 7 minutes

Summary: The Thunderbird ImportExportTools NG add-on is a powerful tool for importing and exporting emails, address books, and other data. However, some users have reported that Thunderbird ImportExportTools NG is not working and needs to be fixed. If you’re having the same problem, don’t worry! this article helps you resolve the ImportExportTools NG issues.

Importance of the Thunderbird ImportExportTools NG

For Thunderbird users, ImportExportTools NG is a must-have add-on. It gives more control over their email data and helps to expand Thunderbird’s functionalities. Using this add-on, you can easily:

  • Move your emails and folders from other clients or create a backup of your Thunderbird profile data.
  • Transfer or move Thunderbird configuration, including accounts, settings, and add-ons to another computer.
  • Customize the formatting and layout of your printed emails, including header borders and attachment lists.

Overall, ImportExportTools NG is an effective and powerful add-on that makes email management more efficient. However, users often encounter some issues with this add-on.

Common Issues Faced When ImportExportTools is Not Working

When the ImportExportTools NG add-on is not working, Thunderbird users experience the following issues. Here’s a breakdown of the most common problems encountered.

  • Failure in Import/Export Emails: If you have incorrectly configured the email account or you’re trying to import/export the incompatible file format.
  • Data Corruption While Importing: The download of the import file is incomplete, or there is an issue with the source file itself.
  • Files are Missing After Exporting: Insufficient storage space can cause this issue, or sometimes the export path needs to be configured.
  • Slow Performance Issue: Insufficient system resources or large datasets being processed may encounter this issue.

From the above discussion, we understand Thunderbird ImportExportTools NG, its importance, and the common issues faced by users. Now, let’s move on to the step-by-step process to fix the ImportExportTools NG add-on not working.

How to Fix Thunderbird ImportExportTools NG is Not Working?

After installing this add-on, if you’re having trouble importing/exporting emails from MBOX files or if the import MBOX file is greyed out, here we are providing three easy fixes that you can try to fix the problem:

Method 1. Configure Your Email Account Properly

Sometimes, users directly try to import or open MBOX files in Thunderbird. In such cases, the ImportExportTools add-on doesn’t work properly. It requires the correct configuration of an email account. You can follow the steps below to adjust your email account settings and ensure your account is configured correctly.

  • Open Mozilla Thunderbird on your system. mozilla thunderbird interface
  • Click on the Tools menu or select the hamburger menu (three horizontal lines). hamburger menu
  • Now, click Account Actions and select the Add Mail Account option.add mail account
  • Enter your name, email address, and password to continue. name email and password
  • After that, enter your Incoming Mail and Outgoing Mail settings in the Manually Configuration option. (Recommended using IMAP) incoming and outgoing server
  • Click Next and verify your account information.
    After that, you can click Done to set up your email account.

Now, close the Account Settings window and restart Thunderbird. Once it starts, you can test the ImportExportTools NG add-on. If the issue persists, you can follow the next method to fix this problem.

Method 2. Update Thunderbird and ImportExportTools NG

In this method, you can ensure that both Thunderbird and the ImportExportTools NG add-on are updated. You can follow the steps below to check and install the updated version.

For Updating Thunderbird

  • Open the Thunderbird application on your computer.
  • Go to the Menu or click on the hamburger menu (three horizontal lines) in the top right corner.hamburger menu
  • Now, select the Help option and click About Thunderbird. about thunderbird
  • If updates are available, you can click on Install Update to download and install them. thunderbird is upto date
  • Once the updates are installed, you can restart the application to complete the process.

Updating ImportExportTools NG

  • Open Thunderbird and click on the hamburger menu.
  • Select Add-ons and click on the Extensions tab in the Add-ons Manager window. select extensions
  • Find the ImportExportTools NG add-on in the installed extensions. importexporttools ng
  • Click on the three dots next to it. A menu will appear if updates are available. update shows here
  • Now, select Update Add-on to install the latest version.
    After installation, it prompts to restart Thunderbird. Click Restart Now to verify its smooth functioning.

Method 3. Reinstall ImportExportTools NG Add-on

In some cases, the above solutions couldn’t fix the ImportExportTools NG add-on not working properly issue. If it applies to you, try reinstalling this add-on to ensure its smooth functioning.

  • Open the Thunderbird application and click on the Tools Menu or the hamburger menu in the top right corner.hamburger menu
  • Now, select the Add-ons and Themes option. addons and themes option
  • From the Extension tab, find the ImportExportTools NG add-on. importexporttools ng
  • Click three dots and select Remove. remove addon
  • Now, confirm and click Remove again. confirm remove
  • Close Thunderbird application. After a few seconds, restart it.
    Follow the steps again to select Add-ons and Themes. addons and themes option
  • Search ImportExportTools NG and click Add to Thunderbird. add to thunderbird
  • Finally, select Add to confirm and restart the application after installation.confirm add

Now, you can use the add-on to import MBOX files in Thunderbird or to export the mail items. However, what if the above techniques can’t fix the issue? Don’t worry! We have an alternate solution to import or export emails from MBOX files.

Alternate Solution to Export Emails from MBOX Files

Thunderbird ImportExportTools NG add-on is the most popular option for importing or exporting emails from MBOX files. However, it does have some limitations that couldn’t allow you to rely on this add-on. The best way to export MBOX files is to opt for Regain MBOX to PST Converter. It offers more powerful and advanced functionalities to convert MBOX files to PST, EML, PDF, and other popular formats.

Free Download100% Secure Buy NowPrice: $29

Following are some reasons why you should choose Regain MBOX to PST Converter as an alternate solution to the ImportExportTools NG add-on.

  • It allows you to import MBOX files to Gmail, mbox to Office 365, Yahoo, and other popular email clients.
  • You can easily convert or migrate multiple files in a single run to save time and effort.
  • It is a more reliable and efficient utility that allows you to manage large conversions efficiently.
  • Preview features, advanced filtering, and batch processing are advanced functionalities that give you more power and flexibility.


In conclusion, the ImportExportTools NG add-on is a powerful tool for managing MBOX files. However, some users have reported the Thunderbird ImportExportTools NG is not working properly. In such cases, considering an advanced MBOX to PST Converter always provides a powerful and feature-rich experience. It can handle multiple file conversions while offering advanced features to ensure smooth and efficient management of your MBOX files.

Frequently Asked Questions:

Q1. How do I install import export tools in Thunderbird?
Ans. You can follow the steps below to install the ImportExportTools NG add-on:

  1. Open the Thunderbird application.
  2. Go to the Tools menu or click on the Hamburger menu.
  3. Select the Add-ons and Themes option.
  4. Click on the Extension and find ImportExportTools NG.
  5. At last, click Add to Thunderbird and restart the application.

Q2. How do I import MBOX files into Thunderbird?

Ans.Using the ImportExportTools NG add-on, you can import MBOX files into Thunderbird:

  1. You can select Tools from the Hamburger menu.
  2. Hover over ImportExportTools NG and select the Import MBOX file option.
  3. You can Import directly one or more MBOX files.
  4. Then, select the MBOX file in the system.
  5. At last, click open.

Q3. How do I import MBOX without Thunderbird?

Ans. You can easily import MBOX without Thunderbird using our Regain MBOX to PST Converter. This advanced software can directly migrate single or multiple MBOX files to Gmail, Yahoo, Office 365, or other popular email clients. Try its free demo to experience its advanced functionalities.

Author: Nasir Khan

I am Nasir Khan from India, working as a Content Developer in Regain Software. Here I am writing about our products and their updates. And writing some free solutions from converting emails or Cloud Migration process. We have tools like Email Converter, Emails backup and Cloud migration.

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