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Written By Amit Chandel
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Updated on September 27th, 2025
Nathalia’s Query: “I recently switched from Thunderbird to Outlook for more secure storage and access. But Outlook supports the MSG format, and all my important emails are in Thunderbird. Is there any solution to export emails from Thunderbird to MSG?”
Users who have been using Thunderbird for a long time are aware of its features and usage. It is a free, open-source email platform to receive, send, and manage emails. But sometimes a user may need to export Thunderbird emails to MSG for multiple scenarios. This includes legal or compliance needs, archiving purposes, attachment management, etc. In this blog, we will cover a free solution and will use an advanced utility such as MailConverterTools Thunderbird Mail Backup Tool with accurate results.
Let’s understand the purpose of the user to convert emails from Thunderbird to a MSG file. Read the several reasons pointed out below:
There are two efficient methods to make this conversion successful. The first solution is an indirect way to export and is only recommended for personal use. For organizational or business purposes, using a professional Thunderbird Mail Backup Software is recommended. This tool makes the process easier and smoother with effective output.
This method is a manual approach, where you have to apply each step on your own. It requires technical expertise and prior knowledge of Thunderbird and its Add-ons. For better understanding and readability, the steps are divided into three parts. Missing any step can lead to errors and incomplete conversion.
Step 1: Install the ImportExportTools NG Add-on in Thunderbird
Step 2: Export Thunderbird Emails as EML Files
Step 3: Move Thunderbird emails to MSG Format
Limitations:
This method is a perfect solution for users with a large mailbox. It converts emails in multiple formats, like PST, EMLX, EML, DOC, DOCX, PNG, etc. This tool supports bulk conversion and offers a preview option before the conversion. Moreover, you can convert your mailbox with or without attachments in a few clicks.
Steps to Save Thunderbird to MSG
Successful User Case:
Problem: “A marketing firm wanted to migrate all employee emails from Thunderbird to Outlook without losing attachments or formatting. Manual methods were too slow and error-prone.”
Solution: They used the Thunderbird Backup Tool to export entire mailboxes to MSG format in bulk.
Result: All emails were successfully converted with attachments intact, and employees could start using Outlook immediately without data loss.
Explore More: Export Thunderbird Emails to CSV
In this blog, we discussed the reliable methods to export Thunderbird emails to MSG. Converting with manual methods will only work if you have a few files. Otherwise, it may lead to errors or an incomplete process. Using a professional tool for a large mailbox is an effective way to convert Thunderbird to the MSG file format. The tool is an effective solution for accurate results and a smooth process.
Ans. The best way to export Thunderbird emails into MSG is by using a professional MailConverterTools Thunderbird Backup Tool. It saves time and maintains email formatting, and supports bulk migration.
Ans. Yes, you can. If you go with the manual method, Outlook is required because the EML to MSG conversion happens inside Outlook. But if you use a professional converter tool, it works independently and does not need Outlook installed on your system.
Ans. Absolutely. With the right software, you can select the whole Thunderbird profile or specific folders and export them all into MSG format in one go.
About The Author:
Meet Amit, an experienced SEO expert and content planner. He uses his creativity and strategy to create content that grabs attention and helps brands reach their goals. With solid skills in digital marketing and content planning, Amit helps businesses succeed online.
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