Import MSG to Thunderbird Account: Ultimate Conversion Guide

What Is an MSG File and Why Is It a Problem?

• An MSG file is an email format created by Microsoft Outlook. When you save an email from Outlook onto your computer, it gets stored as a .MSG file. This single file holds everything about that email: the sender, the recipient, the subject line, the body text, all attachments, and even hidden metadata.
• Here is the core problem: MSG is a Microsoft proprietary format. It was built specifically for Outlook and is not designed to work with any other email client — including Mozilla Thunderbird. Thunderbird stores emails in a completely different format called MBOX, which is a plain text-based format. These two formats are fundamentally incompatible at a technical level.
• That is why dragging and dropping MSG files into Thunderbird will not work.

Why Thunderbird Cannot Open MSG Files Natively

Thunderbird has no built-in engine to decode or read the binary structure of an MSG file. There is no setting you can change to open Outlook .msg files in Thunderbird. Without a conversion step in the middle, these two formats simply do not connect.

To get your MSG emails into Thunderbird, you have two methods:

• Convert the MSG files into a format Thunderbird understands, such as MBOX or EML
• Use a dedicated tool that does this conversion automatically and accurately

Manual Method to Import MSG to Thunderbird

If you still have Microsoft Outlook installed on your computer, you can try this free workaround. Here is how it works:

1. Firstly, open the MSG file in Microsoft Outlook by double-clicking it.
2. In Outlook, go to File and choose Save As. Save the email in a format like EML or HTML.
3. Now, open Mozilla Thunderbird. Go to Tools, then Add-ons and Extensions.
4. Search for the add-on called ImportExportTools NG and install it. Restart Thunderbird.
5. After that, right-click on a folder in Thunderbird and look for the ImportExportTools NG option. Use it to import the EML files you saved from Outlook.
6. Your email should now appear inside Thunderbird.

Professional Tool to Import MSG to Thunderbird

If you have 1000+ MSG emails, then you can directly use the reliable DRS MSG File Converter. This tool is specifically designed to convert a single or multiple MSG emails at once. It is safe, secure, and highly recommended software. Built with several advanced features, like Preview, Remove Duplicate, Date Filter, and more. It has a simple interface, which means every user (Technical and Non-Technical) can easily perform it. Moreover, you can convert MSG to PDF and other formats.

Step-by-Step: How to Import Outlook MSG to Thunderbird

1. Download and install the DRS Outlook MSG Converter.
2. Choose “Select Files” or “Select Folder” to add your MSG files.
3. Then, you can preview and select the MSG emails to convert.
4. Afterwards, pick Thunderbird as the Saving Format from the list.
5. Lastly, apply advanced features and filters as per your needs. Click Convert.

Why DRS MSG Converter Is the Best Choice to Migrate Emails from MSG to Thunderbird

Batch Conversion You can load an entire folder of thousands of MSG files and convert them all at once with a single click.	Zero Data Loss Every element of your original email is preserved: sender and recipient details, subject, body text, etc.
No Microsoft Outlook Required The tool reads MSG files independently. You do not need Outlook installed. You do not even need to have ever had Outlook on that machine.	Simple Enough for Anyone The interface is clean and straightforward. You do not need to be an IT professional or have any technical knowledge to use it.
Completely Private and Secure DRS runs locally on your PC; your email data never touches a server. There is no account to upload, nothing.	Built-in Email Preview  Before converting anything, you can browse and preview your MSG files inside the tool.

Manual Method vs DRS — Quick Comparison

Features	Manual Method	DRS
Requires Outlook installed	Yes	No
Batch conversion	No, one file at a time	Yes, thousands at once.
Data integrity	Risk of loss	100% preserved
Attachments preserved	Sometimes lost	Always preserved
Ease of use	Multi-step, complex	Simple, one-click
Privacy	Moderate	100% local, nothing shared

Conclusion

Importing MSG to Thunderbird is useful for users who want to access Outlook email files in a free and open-source email client. In this blog, we discussed the manual method and a professional tool to import MSG to Thunderbird. The manual method is only suitable for a small number of MSG emails. However, it has several limitations. Thats why its best to use the professional tool. This tool supports bulk conversion with several advanced features. At the end, no data is lost, shared, or uploaded.

Frequently Asked Questions