Complete Guide to Export Thunderbird Emails into MSG

Written By Adom James
Updated on January 8th, 2026

David’s Query: “I have important emails stored in Mozilla Thunderbird. But now I need them in MSG format for Outlook access and legal documentation. What is the safest way to export Thunderbird Emails into MSG without losing details?”

Introduction: Mozilla Thunderbird is widely used as a free email client. But it does not natively support MSG format, which is primarily used by MS Outlook. Many users face challenges when switching platforms in the Outlook format. This guide explains how to export emails from Thunderbird to MSG manually. Also, explains a professional CloudMigration Thunderbird Backup Tool. This helps you to complete the process effectively.

Table of Contents

Understanding the Thunderbird and MSG Format

Before going deep, let’s understand the two formats.

Thunderbird:

It stores emails locally in MBOX format. This is compatible with open-source email clients but not directly supported by MS Outlook.

MSG:

On the other side, it is a proprietary Outlook file format that preserves email, headers, attachments, metadata, and formatting.

Note: Due to this format incompatibility, direct conversion is not possible without additional steps or tools.

Easy Steps to Export Thunderbird Emails into MSG

Launch the CloudMigration Thunderbird Backup Software.
Expand the data structure and preview the details.
Choose MSG as the saving format.
Apply the advanced filters and click Convert.

Quick Solutions:

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Why Export Thunderbird Emails to MSG?

There are several reasons why users choose MSG over Thunderbird:

To access Thunderbird emails in Microsoft Outlook.
For legal, compliance, or forensic email storage.
Sharing emails individually in an Outlook-supported format.
Preserves email metadata and attachments.
Moreover, for professional email archiving and backup.

Programmed Method to Convert Thunderbird Emails to MSG

Thunderbird does not offer a direct option to export to MSG. However, a workaround exists using Outlook as an intermediate step. But keep in mind that this method is time-consuming and limited to small mailboxes.

Manual Steps to Export Thunderbird Emails into MSG

Firstly, install the ImportExportTools NG add-on in Thunderbird.
Now, export Thunderbird emails to EML format.
After that, install Microsoft Outlook.
Then, drag and drop EML files into Outlook.
Lastly, save each email manually as MSG.

Limitations to Export Emails from Thunderbird to MSG

This process requires a Microsoft Outlook installation.
Extremely time-consuming for large mailboxes.
There is no bulk MSG export option.
Risk of data loss or formatting issues.
It is not suitable for non-technical users.
Additionally, the folder hierarchy may not be preserved properly.

Standard Tool to Export Thunderbird Emails to MSG

To overcome the limitations of the manual method, use a professional Thunderbird Backup Tool. This solution allows users to export Thunderbird Emails to CSV with zero data loss. The tool ensures the process with complete data integrity and security. Additionally, it migrates multiple emails simultaneously and comes with a free demo version.

One-Time Migration Service

If you prefer not to use software yourself, a one-time email migration service is available. Experts securely export Thunderbird Emails into MSG and deliver the files within a short turnaround time. Thus, it is ideal for business users, legal teams, or non-technical individuals.

Complete Walkthrough to Use the Software

Firstly, install the CloudMigration Thunderbird Backup Utility.

Now, choose the profile via which you want to migrate and click Next.

After that, drag the tree structure, preview the mailbox, and click Next.

Then, select MSG as the saving output format.

In the end, apply the advanced filters and click Convert to start.

Advantages to Export Thunderbird Emails into MSG

Allows users to migrate Thunderbird to Google Workspace.
Selective folder and email conversions.
Preserves email metadata & attachments.
There is no Outlook dependency.
It has a user-friendly interface for non-tech users.
Moreover, the tool is compatible with Windows OS.

Note: This is the highly recommended software that allows users to migrate Email from Thunderbird to Office 365.

Criteria for Selecting Manual and Automated Approaches

Selecting the right approach to convert Thunderbird Emails to MSG depends on the emails, time constraints, and data accuracy requirements. Below is a clear table that helps you choose the suitable option.

Choose Manual Approach When:	Choose an Automated Approach When:
You have very few emails to export.Microsoft Outlook is already installed on your system.The export is one-time and non-critical.You are comfortable performing multiple technical steps.Minor formatting changes or delays are acceptable.	You need to export large mailboxes.You want a fast, accurate, and error-free process.You do not want to depend on Microsoft Outlook.The data is for business, legal, or compliance purposes.You require features like preview and selective conversion.
Best for: Personal use, small mailbox exports, or trial conversions.	Best for: IT professionals, enterprises, legal teams, and users handling sensitive data.

Final Recommendation: If your requirement is minimal and non-urgent, the manual method can work. However, for secure conversion, the automated method is strongly recommended.

Conclusion

In short, exporting Thunderbird emails into MSG format manually is possible but inefficient and risky. For accurate and secure results, an automated Thunderbird backup tool is the best choice. Whether for Outlook migration, compliance needs, or long-term storage, using this tool to export Thunderbird Emails into MSG ensures data integrity and peace of mind.

Frequently Asked Questions

Q1. Can Thunderbird export emails directly into MSG?

Ans. No, Thunderbird does not provide a native option to save emails directly into MSG format. Since MSG is an Outlook-specific format, you need either a manual workaround or a Cloudmigration Thunderbird backup tool.

Q2. How can I export Thunderbird emails into MSG format?

Ans. You can convert Thunderbird emails to MSG by using a dedicated Thunderbird backup tool. It is the safest and fastest way, as it preserves email properties, attachments, and folder structure.

Q3. Can I export multiple Thunderbird emails into MSG at once?

Ans. Yes, with an automated CloudMigration solution, you can change multiple Thunderbird emails, or entire folders, into MSG format in bulk. Manual methods usually support only limited or one-by-one exports.

Q4. Is it safe to export Thunderbird emails into MSG?

Ans. Yes, exporting Thunderbird emails into MSG is completely safe when using a reliable CloudMigration Thunderbird backup tool. It ensures data integrity, keeps attachments intact, and prevents data loss during the conversion process.

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.