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Written By Evren Cole
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Updated on October 8th, 2025
User Query: “I have recently switched email clients from Outlook to the Mozilla Thunderbird email client. Since Thunderbird does not support.MSG files directly, I would like to discover how I can easily and safely Access MSG Files in Mozilla Thunderbird with attachments in Thunderbird. What is the best possible solution?”
There are a couple of common reasons users like to import MSG into Thunderbird.
Generally, people want these types of benefits. Hence, they search for a safe and effective way to access MSG files, which allows the user to open the file with Thunderbird..
In short, no. Mozilla Thunderbird is limited in that it is unable to work with the MSG file format, as it primarily uses MBOX and EML files. This prevents it from being able to import or open the MSG file format directly.
Since Thunderbird does not natively support MSG files, you need to rely on alternative approaches. There are mainly two effective ways to import MSG into Thunderbird: one is a manual process that uses Outlook, and the other is a professional tool designed to make the migration quick and error-free. Let’s go through each of the methods for the conversion in detail.
If you still have access to Outlook, you can determine the EML format, which can also be used in Thunderbird.
The MSOutlookHelp MSG Converter Tool offers an efficient process to transfer MSG files to Thunderbird. Users can quickly migrate MSG files into Thunderbird without losing formatting or folder structure. The convenience of bulk conversion of MSG files to Thunderbird is also available when attempting to migrate a large number of MSG emails. When the conversion process is complete, you can easily view all converted MSG emails in Thunderbird. Along with Thunderbird, you can also import MSG to Gmail with other email clients.





This technical article describes the procedure to import MSG to Thunderbird successfully. The manual process is based on Outlook and will work for a very limited number of emails, but it is tedious and requires quite a few technical steps. Recommended systematic approaches allow you to migrate multiple emails at once. Also, it provides a folder hierarchy and manages a quick and smooth transfer of all MSG files.
Ans. Yes, using the MSOutlook MSG Converter, you can access MSG files in Mozilla Thunderbird before the conversion.
Ans. The best way is to use the MSOutlook MSG Converter tool. You can simply import MSG to Thunderbird within a few clicks.
Ans. No, the MSOutlook MSG Converter doesn’t require Outlook installation. It independently converts MSG files to Thunderbird-compatible formats.
Ans. Yes, the MSOutlook MSG Converter includes an advanced duplicate removal feature. It scans and removes identical MSG emails before conversion.
About The Author:
Evren Cole is an expert in Email and Data Management. She has a strong passion for technology and entrepreneurship. In her free time, she enjoys football, music, and reading books.
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