How to Import MSG to Thunderbird Safely in 2025

Written By Adom James
Updated on October 9th, 2025

William’s Query: “I recently moved from MS Outlook to Mozilla Thunderbird. However, I have hundreds of MSG files saved from my old Outlook account. How can I import MSG files to Thunderbird with attachments?”

Introduction: This situation is quite common. However, MSG files are supported by Outlook. Whereas Thunderbird does not support them directly. Therefore, sharing MSG to Thunderbird requires a proper approach. Although there are some free manual methods available, they are complicated. Hence, the most reliable way to import MSG to Thunderbird is by using a CloudMigration MSG Converter tool. Therefore, this ensures complete data accuracy.

Table of Contents

Real-World Scenario:

For instance, imagine a marketing professional who has stored emails as MSG files. When saving to Thunderbird, the files are inaccessible. Manually converting each file could take hours. Therefore, using a dedicated tool to open MSG files in Thunderbird ensures quick and secure migration.

Easily Move MSG Files into Thunderbird Mail

Download & Install the CloudMigration MSG Converter Tool.
Select Files/Folders to upload the MSG file.
Expand the tree structure and verify the details.
Save the MSG file in Thunderbird.
Apply filters and convert.

Quick Solutions:

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Primary Motives to Import MSG to Thunderbird

Firstly, Thunderbird is an open-source client visible on multiple platforms.
Unlike MS Outlook, Thunderbird is free to use and doesn’t require licensing.
Therefore, users can organize, tag, and search emails efficiently.
Moreover, saving MSG to Thunderbird provides a secure way to back up Outlook emails.

Note: If you want to learn more, you can also explore how to import MSG to Yahoo Mail

Manual Technique to Import MSG files into Thunderbird

If you don’t prefer to download the software, you can use a manual path. Therefore, there is no direct method to send MSG files to Thunderbird. Although we can convert via MS Outlook, it has several limitations. The following are the steps to migrate MSG files into Thunderbird:

Technique 1. Using MS Outlook

Firstly, install MS Outlook → drag all MSG files into one folder.
Now, install Mozilla Thunderbird → set up an IMAP Account.
After that, in Outlook, move the emails to your IMAP folder.
Alternatively, export the emails from Outlook as EML files → save them to Thunderbird using the ImportExportTools NG add-on.

Limitations to Import MSG to Thunderbird

Firstly, it is necessary to install MS Outlook.
Also, this technique is time-consuming for multiple MSG files.
Moreover, there are chances of losing attachments or formatting.
Therefore, technical knowledge is mandatory to set up IMAP and add-ons.

Detailed Procedure to Import MSG files to Thunderbird

The CloudMigration MSG Converter Tool is the best way to share MSG files with Thunderbird. Therefore, it supports batch conversion. Moreover, it keeps attachments, metadata, and formatting intact. Unlike manual methods, there is no need to install Outlook. Though this process is suitable for technical or non-technical users. Also, this expert software supports various email clients, such as import MSG to AOL Mail.

One-Time Service Available
If you don’t want to purchase the tool, CloudMigration offers a one-time service to import MSG to Thunderbird. This guarantees 100% accuracy and privacy.

Step-by-Step guide to migrate MSG to Thunderbird using the tool:

Firstly, download & install the CloudMigration MSG Converter Tool → Next.
Now, click on Select File(s)/Folders → choose your MSG files to add → Next.
After that, expand the tree structure → Preview to verify the content → Next.
Subsequently, save the MSG file in Thunderbird file format.
Lastly, apply the additional filters (if required) → Convert to start the process.

Key Features of the Software to Open MSG Files in Thunderbird:

Firstly, it imports MSG files into Thunderbird directly.
Therefore, keeps the folder structure and formatting intact.
Moreover, it supports import MSG files to Gmail.
This tool has the feature to preview emails before conversion.

Conclusion

In short, moving MSG files manually is difficult. Therefore, the CloudMigration MSG Converter Tool provides a secure way to import MSG to Thunderbird. Whether you prefer doing it yourself or opting for the one-time professional service. However, you can ensure smooth migration with complete accuracy.

Frequently Asked Questions

Q1. How to import MSG files into Thunderbird easily?

Ans. You can migrate MSG files into Thunderbird using the CloudMigration MSG Converter, which allows direct and secure migration without Outlook or additional software.

Q2. Which is the best tool to open MSG files in Thunderbird?

Ans. The CloudMigration MSG Migrator software is the most reliable option. It ensures smooth conversion of MSG files to Thunderbird while maintaining email formatting, attachments, and metadata intact.

Q3. Do I migrate MSG files into Thunderbird without data loss?

Ans. Yes. With the CloudMigration tool, all MSG files are saved safely without losing any attachments, email formatting, or folder structure.

Q4. Is it possible to import MSG files to Thunderbird with no technical knowledge?

Ans. Absolutely. The tool is designed with a simple and user-friendly interface, allowing even non-technical users to import MSG files to Thunderbird effortlessly.

About The Author:

Adom James

I’m Adom james, a skilled content strategist with a focus on technical writing. With in-depth knowledge in Email Backup, Data Recovery, and Email Migration, I specialize in providing expert solutions and addressing technical challenges for both individuals and businesses, especially in the areas of Cloud Backup and seamless email transitions.