EML to Thunderbird conversion can feel overwhelming, but Mozilla Thunderbird makes this process more manageable. As a free, open-source email client compatible with both Windows and Mac OS, Thunderbird offers versatility and efficiency.
If you’re wondering how to import EML files into Thunderbird, you’ve come to the right place. This article outlines three effective methods: manual drag-and-drop, using the free software and Import/Export Tools add-on. Plus, we’ll explore tips to streamline your email migration!
Why Choose Thunderbird for Email Management?
Thunderbird remains a popular choice for email management due to its compatibility and flexibility. It supports the MBOX format for storing emails, a widely recognized format that works seamlessly with other email services. Whether you’re switching platforms or organizing backups, Thunderbird is up to the task.
How to Import EML Files into Thunderbird
Before importing .eml files into Thunderbird, make sure you have thoroughly exported your EML files from your previous email client. Tools such as Outlook Transfer software can help you export messages from various clients such as The Bat!, Mac Mail, Outlook, Gmail and others to EML format. In addition, email conversion tools can export messages from formats such as Mbox, Mbx, PST or MSF to EML files. Discover the full range of email converters here.
Hassle-free email conversion!
Instant solution to convert Thunderbird emails to Outlook PST format and export Thunderbird messages to EML files. Download Thunderbird Converter and start your hassle-free Thunderbird migration now!
Ensure your EML files are properly exported from your previous email client.
Keep them organized in an accessible folder on your computer.
Once these procedures are done and the files are on your PC, open Mozilla mail client and proceed in the following way…
Step-by-Step: Import EML Files into Thunderbird
Option 1: Drag-and-Drop Method
Example Use Case: You’re organizing your personal email archives and only need to import a few dozen old emails. Perhaps these emails are from a specific project or correspondence that you wish to keep easily accessible in Thunderbird. This method is perfect for such small-scale, quick imports where simplicity is key.
This straightforward method works best for small batches of EML files.
Open Thunderbird: Launch Thunderbird and navigate to the folder where you’d like to import the files.
Create a New Folder in Thunderbird:
Right-click on the parent folder (e.g., “Local Folders”).
Select “New Folder…” and name it something like “Imported Emails.”
Drag and Drop Files: Select the desired EML files from your folder and drag them into the newly created folder in Thunderbird.
Pros:
Simple and intuitive—ideal for users with limited technical expertise.
Does not require any additional software or add-ons.
Perfect for small batches of EML files.
Cons:
Becomes cumbersome and time-consuming when handling large volumes of emails. If you have extensive email data, consider using a more advanced approach.
Lacks automation, requiring manual selection and transfer of files.
Option 2: Using free EML Import Software
Example Use Case: You’re transitioning from an older email client that uses EML files (like Windows Live Mail) to Thunderbird. You have a medium-sized collection of emails spanning several years but don’t want to spend too much time manually moving them. The extra help from software tools makes the process manageable without requiring advanced technical skills.
Here’s a streamlined guide to importing EML files into any email client that supports the POP3 protocol, with Thunderbird as an example:
Set up a Temporary POP3 Account in Thunderbird:
Launch Thunderbird and navigate to the “New +” menu.
Choose “Existing Mail Account…” and complete the form until “Configure manually…” becomes available.
Set the “Protocol” to POP3 and input “localhost” as the server.
Adjust other settings as follows:
Port: 110
SSL: None
Authentication: Normal password
Confirm advanced configurations and close the setup.
Example Use Case: You’re working in an office environment or managing email data for a client. You have thousands of emails, organized in complex folder structures, that need to be imported accurately and efficiently into Thunderbird. This method’s automation and ability to handle large volumes make it the best option for professional or bulk migrations.
For larger volumes of EML files, Thunderbird’s Import/Export Tools add-on provides a better solution.
Install the Add-On:
Click the menu icon in Thunderbird (three horizontal lines).
Select “Add-ons,” search for “Import/Export Tools,” and install it. Follow the prompts to restart Thunderbird.
Create a Target Folder:
Right-click on “Local Folders” and select “New Folder…”
Name your folder appropriately (e.g., “Imported Emails 2025”).
Import Your Files:
Right-click the new folder and select ImportExportTools > Import all messages from a directory > also from its subdirectories.
Locate the folder containing your EML files and confirm your selection.
Verify Import Success:
Thunderbird will create subfolders based on your file structure and display the number of successfully imported emails.
Pros:
Best for handling large batches of EML files efficiently.
Maintains file structure by creating subfolders during import.
Highly automated once the add-on is installed and configured.
Cons:
Requires installation of the Import/Export Tools add-on, which is an extra step.
Could be less user-friendly for those unfamiliar with add-ons or advanced tools.
Pro Tips for a Smooth Email Import
Backup Your Data. Before importing, create a backup of your original EML files to avoid accidental loss.
Organize Files. Group EML files into smaller batches to make the process more manageable.
Use Specialized Software. For bulk transfers or more complex migrations, consider third-party software tools designed for email data migration. These tools automate the process and minimize the risk of errors.
Frequently Asked Questions (FAQs)
What is an EML file? An EML file is a format used to save individual email messages. It contains the email content, metadata, and any attachments.
Can I import EML files into Thunderbird without add-ons? Yes, the drag-and-drop method allows manual import without any additional tools. However, it’s less efficient for large-scale migrations.
What file format does Thunderbird use to store emails? Thunderbird uses the MBOX format, which is widely supported by other email clients, making it easy to transfer data between platforms.
Why Choose Specialized Software for EML File Import?
If you’re dealing with a significant number of EML files or have limited time, specialized tools can make your life easier. These tools automatically detect EML files on your system and guide you through the migration process with minimal manual effort. They’re ideal for non-tech-savvy users and reduce the risk of data loss.
How I may import EML files to Outlook?
For a swift and efficient import of EML files into an Outlook profile or PST file, we suggest using GlexSoft EML to Outlook Transfer tool.
Final Thoughts
Thunderbird is a reliable and feature-rich email client that makes EML file imports straightforward. By following the methods outlined above, you can easily transfer your emails and keep your communication organized. Whether you prefer the simplicity of drag-and-drop or the efficiency of the Import/Export Tools add-on, this guide has you covered.
For those seeking a faster and foolproof solution, consider using specialized software designed for email migration. With regular updates and support for multiple platforms, Thunderbird remains an excellent choice for managing your emails in 2025 and beyond.
This guide is regularly updated to reflect the latest Thunderbird features and email migration tools.
Last updated: September 2025.
Gordon Lex is a highly experienced software engineer with over 20 years of expertise in the technology industry. Since February 2009, he has been serving as a Senior Software Engineer at GlexSoft, where he leads the development of innovative software solutions. A recognized expert in his field, Lex holds prestigious certifications such as Microsoft Office Specialist Master and Certified Delphi Master Developer. Lex is dedicated to advancing software innovation and delivering excellence in every project.
Today software developed by Lex Gordon helps million of people around the World to migrate between different email applications.
With the increasing popularity of messengers, emojis are now widely used to add emotional tint in the exchange of messages. They have even found their place in email communication, both…
Introduction Managing and exporting emails efficiently is crucial for businesses, technical professionals, and users handling large volumes of Outlook data. Data Extraction Kit for Outlook offers a powerful solution for…
Outlook is notorious for its HTML rendering. The system is relatively hostile to the coding, which is why "Send HTML email Outlook" is a common search query. Given the variety…
Migrating emails from Outlook to Thunderbird can seem like a daunting task, but with the right tools and guidance, it can be a smooth process. Let's get together and walk…
How useful was this post?
Click on a star to rate it!
Average rating 4.2 / 5. Vote count: 21
No votes so far! Be the first to rate this post.
As you found this post useful...
Follow us on social media!
We are sorry that this post was not useful for you!
Our company currently offers tools for Thunderbird, Mac Mail, Entourage, Eudora and many other email apps, as well as formats like MBOX, EML and MSG. We make sure that all of its products are timely updated after the release of new Outlook versions, including 32- and 64-bit editions, and guarantees the absence of any ad- or spyware in installation files...
