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How Manually Import MBOX in Thunderbird Account?

Written By Sophia Grace
Marco Devin
Approved By Marco Devin  
Published On November 14th, 2022
User Query: – Hi everyone! I have just bought a new computer and installed my Thunderbird there. Now I have some important MBOX files that I need to access on my new computer. I am not a technically sound person. Hence, I am looking for some ways to import my MBOX files. It would be very helpful if anyone could provide manual and/or free methods.

There have been frequent cases similar to this above user query these days. And thus, with the same concern to import MBOX in Thunderbird, we have brought this article for you.

If you have MBOX files that you want to import and open in your Thunderbird then, keep reading this article. Here, we have discussed an easy and free way for you can use to import your MBOX files in your Thunderbird.

But before we dive deep into the tutorial, let’s quickly familiarize ourselves with Thunderbird and MBOX.

A free desktop-based platform: Mozilla Thunderbird has become a popular choice among users. Along with email management, this email client consists of a calendar, contacts, feeds, and chats as well. It is compatible with both Windows OS and mac OS. Thunderbird stores all its data in an MBOX file.

Users can add numerous free add-ons to their Thunderbird account that contribute to its overall functionality.

Mailbox or MBOX is the collection of emails. It is one of the most popular file formats supported by more than 20 email clients including Thunderbird.

How to Manually Open MBOX Files in Thunderbird account?

Here I am going to elaborate on the method in two steps to import MBOX in Thunderbird account. Follow all the mentioned steps below carefully:

First, we will install a tool which is called as ImportExportTools NG add-on. This utility is built in Thunderbird, which allows users to export and import MBOX in Thunderbird.

And then, we will open MBOX files to the Thunderbird account to open the data.

Step 1: Install Import/Export Tools NG add-on

To export MBOX to Thunderbird, you must install an add-on called Import/Export Tools NG (Next Gen). This is a free add-on. Using this tool, you can easily import MBOX in Thunderbird.

If you do not have it installed, follow the instructions given below. Otherwise, skip these steps:

  1. Open Thunderbird on your computer.

    Open Thunderbird

  2. Click on the three horizontally stacked lines.

    horizontally stacked

  3. In the appeared drop-down menu, select the Add-ons option.

     Add-ons option

  4. Type and search for Import/Export Tools NG in the search bar.


  5. Select the first option Import/Export Tools NG in the search results.


  6. Click on Add To Thunderbird button.

    Add To

  7. The add-on is installed in your Thunderbird.

Now that you have installed the add-on let’s move on to the next part; importing MBOX to Thunderbird.

Also Read: How to Convert MBOX to PDF File?

Step 2: Import MBOX in Thunderbird Account

This tutorial will guide you to import MBOX in Thunderbird account.

Thunderbird email client provides you with the option of adding add-ons to make your account advanced according to your needs. The add-ons are free. They contribute to the overall functionality of Thunderbird.

Follow the given instructions to proceed.

  1. Open Thunderbird.
  2. Right-click on your username and Select Import/Export Tools NG >> Import MBOX File.

    import MBOX in Thunderbird

  3. Next, select Import directly One or more MBOX files and then Click OK.

    Import directly

  4. Select the MBOX files you need to import and click OK.

    MBOX files

  5. Check that your emails have been imported into your Thunderbird.

Now that you have your MBOX files installed in your Thunderbird, you can easily access them.


We discussed one of the easiest ways you can choose to import MBOX in Thunderbird. If you have your data stored in MBOX format usually then, absolutely go for this method and open MBOX files in Thunderbird. The provided method is manual as well as a free method you can execute with ease. We hope you can get the guidance you need from this tutorial.