How to Import MBOX Files into Thunderbird? – Top 4 Methods Explained

Jamie Kaler ~ September 30, 2024 ~ 9 Minutes Reading

In this guide, you will learn how to import MBOX files into Thunderbird effectively, whether using automated tools or manual methods. Importing MBOX files to Mozilla Thunderbird is highly beneficial for those users who need to migrate their email client from various email platforms or backup options. MBOX file is a widely used file format that contains email messages in a single file, making it convenient for archiving and sharing large amounts of data.

Thunderbird is an open-source email client created by Mozilla. It offers robust features for managing emails, making it an ideal choice for users who want to import MBOX files into Thunderbird.

In this guide, we have shared the way to add MBOX to Thunderbird, the prerequisites for a successful import and troubleshoot tips for common users. Whether you are transiting from another email client or simply looking to access archived emails, this post will share the proper information needed to import Gmail MBOX to Thunderbird.

Know More about MBOX File

MBOX(Mailbox) is a file format used for storing email management in a single, continuous text file. This format is a commonly used file format used by various email clients, including Thunderbird, Apple Mail and Eudora due to its simplicity and efficiency in handling multiple email messages. Each email is stored.

Why Do Users Want to Add MBOX to Thunderbird?

  • Users often need to switch from another email client to Thunderbird. Since MBOX file is commonly used file formats. Importing MBOX to Thunderbird makes it simple for migration data from clients like Apple Mail, Eudora, Gmail, or any other MBOX supported email platform.
  • It is also used for archiving emails for storage or backup.. Adding these MBOX files into Thunderbird allows users to access, find, and manage their archived emails directly from the email client to ensure they have all important information at hand.
  • You can easily consolidate their email accounts or archives into a single, organized interface. This allows for centralized email management, making it easier to find, sort and respond to emails without switching between different applications.

How to Import MBOX to Thunderbird Via Automated Approach?

If you want to add MBOX to Thunderbird then we recommend you to choose Jagware MBOX Converter as it is capable of converting and importing a single or batch number of MBOX files without losing any single information.

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  1. Download and install software on your machine then open it. run import mbox to Thunderbird
  2. Select and upload MBOX file by select files or folder as per required.add MBOX files
  3. Now, select Thunderbird in the multiple option of Select saving option.select Thunderbird
  4. Browse Advanced filter options as per required.choose advanced filter
  5. Finally, click on Convert to see the live progress report.click convert
  6. After that, The Software shows you the Completion message and redirects you to the output location.Import MBOX to Thunderbird completed

Premier Attributes of the Automated Application

  • It can easily convert a single or batch number of MBOX files at one shot.
  • With this wizard, you can also take advantage of user–friendly interface to easily operate by beginner as well as professional users.
  • You can also import MBOX to Gmail, Entourage, Apple Mail and many more with maintained attributes.
  • This software also comes with an advanced filter option to convert necessary data as per date range, subject, sender and recipients and also you can also exclude folder as per required.
  • This software is a standalone application to import MBOX files to Thunderbird without depending on any other application.

What is “Import/ExportTools” Add-on?

It is an extension provided by Mozilla to perform various operations in Thunderbird related to import/export or backup as per your needs. It allows users to import and export folders or messages with multiple options. With this Add-on you take a scheduled backup of all the files of a profile or only the mails, and now you can import any saved profile too. This Add-on is compatible with all versions of Mozilla Thunderbird and can be easily downloaded from the web.

User Concern about Import MBOX file to Thunderbird

“Hello, I was using Apple Mail at my old workplace, but I just moved jobs. I have an MBOX file that was generated from Apple Mail and I want to import it into another email client. Because I am using Thunderbird at my new workplace, I need to transfer my files as soon as possible. Could someone assist me in the same way?”

Manual Way to Import MBOX in Thunderbird

First, you need to install Add-ons in Thunderbird for the importing process.

#1: Step to Install Add-ons

The Import/ExportTools NG add-on works on Thunderbird 60.* –  78.* versions.

  1. Firstly, open the Thunderbird application on your system.
  2. Secondly, click on the Three vertical lines on your upper right corner screen.import MBOX file in Thunderbird
  3. After selecting the Add-ons option, type ImportExportTool NG (NextGen) in the search bar.select Add-ons option
  4. On the next screen, click on the “Add to Thunderbird” option and add the plugin to Thunderbird successfully.Add to Thunderbird

#2: Import MBOX File to Thunderbird

  1. Open the Thunderbird application.
  2. Right click on the Thunderbird profile.
  3. Then, mouse over to the ImportExportTools NG >> Import MBOX file option.import MBOX to Thunderbird
  4. Select the “Import directly one or more mbox files” option.choose import directly option
  5. Choose the MBOX file from your local system.choose MBOX file

After attempting all the steps, you can see the MBOX file import in Thunderbird successfully.

Limitations of the Manual Process

  1. This method will take time and effort.
  2. To opt for all these steps, you should know the technicalities.
  3. Maybe in this importing process, you lost your attachments.

How to Add MBOX to Thunderbird Via Manual Import Method?

If you are aware of the file management feature then you can copy the MBOX file and import it into the Thunderbird profile. Follow the steps below.

  1. Open CMD and enter MBOX File location in Thunderbird.
  2. Now, click on create a new folder within the local folder.
  3. Copy the MBOX file into the new folder,
  4. Open Thunderbird and the newly added MBOX file should appear under local folders.
  5. This method is particularly useful for small MBOX files when Thunderbird can recognize them automatically.

Challenges of Manual Approach

  • Accessing the Thunderbird profile folder using the command line requires familiarity with file paths and system commands. This can be challenging for beginners who are not comfortable with system files.
  • Copying and pasting the MBOX files into the profile folder can lead to data loss or corruption if not performed correctly.
  • The manual method doesn’t preserve the original folder structure. Emails may lose their organizations. Leading to confusion and the need for manual sorting and arrangement within Thunderbird.
Import MBOX to Thunderbird Mac

Unfortunately, Thunderbird on Mac only supports importing data from configured email accounts such as Apple Mail, Eudora, or any client installed on that machine.

#1: Step to Import MBOX file in Apple Mail

  1. We opened Apple Mail, which was already configured on his machine, and created a new mailbox in it.
  2. Next, we have chosen the “import MBOX file on Mac” option to import the MBOX files from the machine to Apple mail.
  3. After successfully importing all the data into Apple Mail, we opened a Thunderbird account and imported the data from Apple Mail into Thunderbird.

#2: Import MBOX to Thunderbird Mac

  1. Open, Thunderbird on a Mac machine.
  2. Click on the Menu Icon >>Tools >> Import option.
  3. On the next screen, select the Mail option and hit the Next button.
  4. Select the “Apple Mail option” and click the next tab.
  5. Apple Mail MBOX data will be visible in Thunderbird under the folder “Apple Mail Import.” All of your Apple Mail data will be saved in this folder.
Drawbacks of Manual Method on Mac
  1. There is no direct method to import MBOX files into Thunderbird for Mac.
  2. The time-consuming process
  3. You must install Apple Mail on your Mac machine.
Often Inquired Questions

How do I Import a MSG file into Thunderbird?
To import a .MSG file into Thunderbird, convert it to .EML format first, then drag and drop it into Thunderbird. Alternatively, use an add-on like Import/ExportNG Tools.


How do I Import my Inbox into Thunderbird?
To import your inbox into Thunderbird, export your email data in MBOX or EML format, then use Thunderbird’s Import/ExportNGTools  add-on to import the mailbox into your account.


What is a Thunderbird MBOX file?
A Thunderbird MBOX file is a mailbox file format used by Mozilla Thunderbird to store email messages from a folder in a single, plain-text file with the MBOX Extension.


Let’s Wrap Up

In this guide, we explore various methods to import MBOX files into Thunderbird, including using Import/Export NG Tools, the manual import method, and an automated solution. As there is no guarantee of mailbox data of maintained result. So, we recommend you to download for an easy and error-free experience.

Read More: How to Fix Import MBOX File Greyed Out Error in Thunderbird

Suggestion: Aside from that, you may need to import Thunderbird emails into MS Outlook at some point. Because MS Outlook is a commonly used e-mail program by both business and home users, it is likely that you want to switch from Thunderbird to Outlook. In this case, all you need to do is save Thunderbird MBOX into MS Outlook PST file format.