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Written By Shivam Rathore
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Updated on May 28th, 2026
User Query: I need to open my MSG files from Outlook in Thunderbird. Is there a simple way to just convert these MSG files to EML without messing up the attachments or email formatting?
When you switch to a different email client from Outlook, the MSG files become almost inaccessible. It is difficult to open or read MSG files outside of Outlook without converting them first. This blog explains how to convert MSG to EML using a manual method you can try without spending anything. It also covers the EmailProHelp MSG Converter Tool for anyone dealing with a large batch of files or wanting cleaner results.
MSG is a file format created by Microsoft, and it only really works well inside Outlook. The user can not open an MSG file in Thunderbird or any other email client. It stores everything together, the email body, attachments, and sender details, all packed into one proprietary file. The problem is the proprietary part. Since Microsoft owns the format, other email clients cannot access this file.
EML is different. It’s an open format that works across pretty much every email client out there. Thunderbird, Apple Mail, Windows Mail, most webmail tools, they all handle EML without any issues. EML file format follows a standard structure that’s been around for a long time.
This method will only work for a few MSG files, and this method allows the migration without any third-party software. It is a cost-free approach that works very well for basic conversion needs.
Steps to Convert MSG file to EML
The EmailProHelp MSG File Converter Tool is a advance way to convert the MSG file to multiple file formats. This smart utility handles the attachment and keeps the original formatting intact during the process. The tool can migrate large files easily without crashing and provides accurate results. Additionally, more than file formats, you can even import your MSG files directly into many email clients, like Outlook, Gmail, or other clients.
Steps to Save MSG as EML Format





To conclude, there are two methods that we discussed to convert MSG to EML file format. Both methods are working well according to the suitability. Using the manual method for limited files will give you better results. But if you want to perform an enterprise-level migration, then using the professional converter tool will provide accurate and intact results. Moreover, if you find any difficulties while using the tool, you can contact our support team for any help.
Ans: The easiest way is to use Microsoft Outlook and save the MSG file as a TXT file first, then rename the extension from .txt to .eml. This method works well when you only need to convert a few files.
Ans: No, Microsoft Outlook does not provide a direct “Save As EML” option. You need to save the email in TXT format and manually change the extension to .eml.
Ans: You can use the EmailProHelp MSG File Converter Tool to convert MSG files to EML without installing Outlook. The tool supports direct conversion while maintaining attachments and email formatting.
Ans: Yes, the professional MSG Converter Tool supports batch conversion. It allows you to convert multiple MSG files to EML format at once, which saves time and effort during large migrations.
Ans: Manual conversion methods may sometimes affect attachments or email formatting. However, the professional converter tool usually preserves email content, metadata, inline images, and attachments during the conversion process.
Ans: Mozilla Thunderbird does not natively support Microsoft Outlook MSG files because MSG is a proprietary Microsoft format. Thunderbird works better with open formats like EML and MBOX.
About The Author:
Meet Shivam, an experienced SEO executive and content strategist. He combines creativity with strategy to craft engaging content that connects with audiences and supports brand goals. With strong expertise in digital marketing and content planning, Shivam helps businesses thrive online.