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How to Add MBOX File to Thunderbird with Attachments [Solved]

Mark Wills ~ Modified: 15-03-2022 ~ Add ~ 5 Minutes Reading

Are you looking for the best and most simple approach to add MBOX file to Thunderbird? if yes, then you are on the right page. Here you will get a complete guide with free techniques to add complete MBOX data into Mozilla Thunderbird with Attachments.

As we know Mozilla Thunderbird is a free email service client that is gaining popularity. Every day, more individuals choose Thunderbird for its simple interface and upgrade functionality. If you utilize Thunderbird, you may need to add MBOX emails because various email applications save data in MBOX format.

“Hello there, Recently, I started using Thunderbird, and my colleague sent me some MBOX files to get me started. Which does not appear to be working. In addition, I am not familiar with the features of Thunderbird. So, could someone propose a method of adding an MBOX file to Thunderbird with Attachments?”

Mozilla Thunderbird & Its Mailbox

Mozilla Thunderbird is a widely used email client that is extremely popular all over the world. Thunderbird is an open-source email client that runs on the desktop to receive and send emails. Also,  Mozilla Thunderbird is an email client that includes capabilities for managing emails, contacts, calendars, tasks, and other data. This email client stores its data in MBOX file.

Thunderbird MBOX File Format

MBOX file, which is one of the most often used file formats. Its derivatives are used by a variety of email clients running on both Windows and Mac operating systems. The MBS file format is used by Opera Mail, while the MBX file format is used by Eudora Mail to keep its data. Both the MBX and MBS files are versions of the MBOX file and can be considered to be identical in terms of functionality and functionality.

Similarly, Thunderbird also uses a derivative format i.e., MBOX file without extension. That’s right, this file although has the same name as the mailbox (like Inbox, Sent, etc.), it has no extension.

Default Location of MBOX File

C:\Users\admin\AppData\Roaming\Thunderbird\Profiles\name.default

How to Add MBOX File to Thunderbird Manually?

Here we will show the easiest and free technique to add MBOX files to Thunderbird.

Preparation: First we will add ImportExportTools NG into Thunderbird, then we will start the procedure.

Add ImportExportTools NG Add-on into Thunderbird

  1. Open the Thunderbird email client on your machine.

    Open the Thunderbird email client to add MBOX file to Thunderbird

  2. Next click on the “Menu” icon or press on “ALT” button.

    click on the Menu

  3. Now press on the “Add ons and Themes option”.

    Add ons and Themes option to add MBOX file to Thunderbird

  4. After that, search “ImportExportTools NG” in the search box.

    ImportExportTools NG tool in the search box

  5. And click on the “ADD to Thunderbird” icon.

    ADD to Thunderbird to add MBOX file to Thunderbird

After successfully processing, restart or refresh the Thunderbird.

Add MBOX Emails into Thunderbird with Add-on

MBOX files can only be added in Local folder or POP accounts. If you have an IMAP account, then import MBOX file in Thunderbird local folders and then copy/move the imported emails  into the IMAP account. There is no shortcut here!

  1. Run the Thunderbird email client again.
  2. Click right on the tools left panel or press on the “ALT” key.
  3. Now choose ImportExportTools NG >> Import MBOX file option.

    ImportExportTools NG tool to add MBOX file to Thunderbird

  4. Select the “Import directly one or more MBOX files” >> OK option.

    Import directly one or more MBOX files

  5. Lastly, browse the location of the MBOX file and click on the “Open” icon.

    browse the location of the MBOX file to add MBOX file to Thunderbird

Lastly, you will get the MBOX file on the application’s left panel.

This is the default method to add MBOX files to Thunderbird with Attachments. But there are some limits, which users have to face during the procedure.

Shortcomings of Manual Methods

This manual technique, like any other, has its own set of restrictions, just like any other. If you attempt to add MBOX file to Thunderbird manually, you may encounter the following problems:

  • There are no attachments.
  • Images inline have become corrupted.
  • Emails have gone missing.
  • Wrong header info has been provided.

Direct Method to Add MBOX Files into Thunderbird

To directly add the MBOX file into Thunderbird, use the NXT Software. The software is created using algorithms that are unique and straightforward, which makes the tool different from other brands of software on the market.

Users can quickly and simply add multiple MBOX files to their Thunderbird accounts with attachments. Additionally, the software includes a straightforward and user-friendly interface that is suitable for both technical and non-technical users. The software is capable of importing all sorts of MBOX files, including MBS, MBX, and others.

In fact, this software will also help you in moving MBOX files to other applications like:

Final Words

In conclusion, nowadays, users are acquainted with Thunderbird and MBOX files. They frequently have to add MBOX to Thunderbird with Attachments. They are unable to import the MBOX file due to a lack of knowledge. So, this post demonstrated many ways to let Thunderbird users upload MBOX files. Users may use ImportExportTools NG add-on or professional import wizard as per choice.