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Here’s How to Open MBOX file in Thunderbird Mail Application in Easy Steps

Published On January 31st, 2024 • 5 Min Read

Are you unable to open MBOX file in Thunderbird email application?

It’s easy! All you need is the right guidance and step-by-step steps. This detailed guide covers the most basic and effective ways to open MBOX files in Thunderbird mail.

MBOX file format is Thunderbird’s own file format which is also compatible with other applications like Apple Mail, Pocomail, etc with both Windows and MacOs. It is easy to open MBOX files in Thunderbird because Thunderbird itself uses .mbox files to store its data. In this article we have provided complete steps to how to open MBOX file in Thunderbird using different strategies. Start reading.

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To read all the MBOX files at once for free, try Online MBOX File Viewer

What is Thunderbird ?

Thunderbird is a Open source email client developed by Mozilla foundation that provides a range of robust features to manage email communication. Thunderbird supports multiple email accounts including POP and IMAP protocols. It also allows handling calendar, tasks, events and chat functionality.

Thunderbird is known as the best email client for professionals and business. Thunderbird stores email mailbox and email folders in MBOX file format. Users who want to migrate their Thunderbird data, use .mbox files. Here it how to open MBOX file in Thunderbird.

#1 How to Open MBOX file in Thunderbird?

To open an MBOX file using the Thunderbird email client, follow these simple steps:

  1. Install Thunderbird and open it.
  2. Go to the Menu and select “Account Settings.
  3. In Account Settings, go to “Local Folders” and browse for the folder containing .mbox files.
  4. Thunderbird will prompt a restart. Click “Restart.”
  5. After restarting, open the file in Thunderbird under “Local Folders.

#2 Open MBOX emails in Thunderbird with ImportExportTools NG Tool

Follow the steps mentioned here to open MBOX emails in Thunderbird with Thunderbird add-on ImportExportTools NG:

  1. Right-click on the User Mailbox and select “ImportExportTools NG.”
  2. In ImportExportTools NG options, choose “Import MBOX File” from the drop-down.
  3. Check the “Import Directly One or More .mbox files” option.
  4. Select the required MBOX file and open MBOX files in Thunderbird.

Note: This tool is suggested by the experts SysTools MBOX File Converter that helps to convert MBOX file to different file format and make it compatible for different email clients. Try is on your own.

SysTools MBOX Converter to Open MBOX files

Can We Open Thunderbird MBOX without Account?

You will be surprised to know that you can open Thunderbird MBOX without account too. Free MBOX Viewer Online Tool allows users to open several Thunderbird MBOX files without needing any email application or an account. This is the easy, secure and free Online tool that can be useful for businesses, professionals and normal users too. Any beginner and non-technical person can use it effortlessly.

Quick Steps to Open Thunderbird emails without Account

  1. Choose “Browse” to pick your .mbox files from your computer for a preview.
  2. Then, click on “Preview Message” to continue.
  3. Scroll down to see and read all your MBOX messages.

Why Use the Free Online Tool to Open MBOX file?

  • The free Online tool to open and access Thunderbird MBOX file from any device just with internet connection.
  • Unlike other software, this online tool does require installation or help of any other application.
  • Users can easily access their MBOX files from anywhere though both computer and mobile just by using a browser.
  • It is easy and straightforward with a user-friendly interface where users can quickly upload their MBOX file and directly open it without the need for advanced technical skills.
  • It also provides you an instant preview of all the data contained in your Thunderbird MBOX file.


We have made it easy to open MBOX emails in Thunderbird! Our guide explained step-by-step to open MBOX file in Thunderbird. Thunderbird uses .mbox format, compatible with various apps. The free online tool lets you access Thunderbird MBOX files without an account for convenience.

Questions Asked by Users:

Q1. What is Thunderbird?

Ans. It’s a free email application with advanced features for managing emails, calendars, tasks, and more.

Q2. How to open MBOX files in Thunderbird?

Ans. Install Thunderbird, go to “Account Settings,” find the .mbox folder, restart Thunderbird, and open the file. Or use ImportExportTools NG tool.

Q3. Can I open Thunderbird MBOX without an account?

Ans. Yes! Online tool lets you open Thunderbird MBOX without an app or account online for free. It’s easy to use for everyone.

Q4. Quick steps to open Thunderbird MBOX without an account?

Ans. Open the Online tool mentioned above, pick MBOX files, click “Preview Message,” and read your MBOX messages.

Q5. Why use the tool for MBOX files?

Ans. It’s easy! No installs needed. Access your Thunderbird MBOX data from any device with a browser. It is user-friendly, no technical skills required, and shows instant previews.