How to Export Thunderbird Mail: 2 Easy Ways

Exporting Thunderbird mail sounds like the kind of chore that should come with a tiny instruction manual, three warning labels, and a support group. Thankfully, it is much easier than it looks. Whether you are moving to a new computer, creating a safety backup, saving old business messages, or preserving that one “important” email thread you keep meaning to organize someday, Thunderbird gives you practical ways to get your mail out of the app and into a safer place.

In this guide, we will walk through how to export Thunderbird mail using two easy methods: Thunderbird’s built-in Export tool and the popular ImportExportTools NG add-on. The first method is best when you want a full profile backup, including mail, accounts, address books, and settings. The second method is better when you want more control over individual folders, selected messages, or export formats such as EML, MBOX, HTML, PDF, CSV, or plain text.

Think of it like packing for a trip. The built-in Export tool is the “throw the whole closet into one suitcase” approach. ImportExportTools NG is the “fold each shirt, label the socks, and pretend you are an organized person” approach. Both work. The right one depends on what you need.

Why Export Thunderbird Mail?

Mozilla Thunderbird is a trusted desktop email client used by people who like control over their inbox, dislike being trapped inside one webmail interface, or simply enjoy having their messages available locally. But email stored on your computer still deserves protection. Hard drives fail. Laptops retire. Operating systems get reinstalled. People accidentally delete folders while looking for a sandwich recipe from 2017. It happens.

Exporting Thunderbird mail helps you:

• Create a backup before changing computers or reinstalling your system.
• Move Thunderbird data to another device.
• Save specific folders or messages outside Thunderbird.
• Keep legal, financial, school, or work-related emails in readable formats.
• Reduce the panic level when your computer starts making “I am about to become a paperweight” noises.

Thunderbird stores user data inside a profile folder. That profile can include your email messages, account settings, address books, calendars, saved preferences, filters, and more. Depending on how your accounts are configured, some mail may be stored locally, some may remain primarily on the mail server, and some may be synchronized through IMAP. Before exporting, it is smart to make sure the messages you care about are actually available in Thunderbird.

Before You Export: A Quick Thunderbird Mail Checkup

Before jumping into the export process, take a minute to prepare your inbox. This small step can save you from creating a backup that looks complete but is secretly missing the emails you needed most. Email backups are like umbrellas: you only discover the holes when it starts raining.

1. Make Sure Thunderbird Has Finished Syncing

If you use an IMAP account, Thunderbird may show your folders while still downloading message content in the background. Open the folders you want to export and allow Thunderbird time to sync. For important archives, check a few older messages and attachments to confirm they open correctly.

2. Clean Up Obvious Junk

You do not need to turn your inbox into a museum exhibit, but deleting obvious spam, emptying Trash, and removing duplicate newsletters can make your export smaller and easier to manage. Just be careful: do not delete anything you may need later. When in doubt, keep it.

3. Compact Folders If Needed

Thunderbird may store mail folders in Mbox format, where many messages in a folder are kept in one file. When you delete or move messages, the storage file may not shrink immediately. Compacting folders helps clean up wasted space. In Thunderbird, you can usually compact folders from the folder context menu or from the File menu. Compacting is not the same as ZIP compression, and it should not delete active messages; it is more like asking Thunderbird to sweep the floor after a long inbox party.

4. Decide What Kind of Export You Need

Ask yourself one simple question: do you want to back up everything, or do you want to export certain emails in a specific format?

• Choose Method 1 if you want a complete Thunderbird profile backup.
• Choose Method 2 if you want selected folders, individual messages, or flexible file formats.

Method 1: Export Thunderbird Mail with the Built-In Export Tool

The built-in Thunderbird Export tool is the simplest option for most users. It creates a ZIP backup of your Thunderbird profile, which can include accounts, messages, address books, and settings. This method is excellent when you are moving to a new computer or creating a full emergency backup.

Best For

• Full Thunderbird backups
• Moving Thunderbird to another computer
• Saving accounts, messages, address books, and settings together
• Users who want the easiest built-in option

Step-by-Step: Export Thunderbird Mail Using the Built-In Tool

1. Open Thunderbird. Let it fully load and sync your folders if you use IMAP.
2. Click the menu button. This is usually the three-line menu icon in the upper-right area of Thunderbird.
3. Go to Tools. From the menu, choose Tools.
4. Select Export. Thunderbird will open its export screen.
5. Click Export. This starts the process of creating a profile backup.
6. Choose a destination folder. Pick a safe location such as an external hard drive, USB drive, cloud-synced folder, or a dedicated backup folder.
7. Name and save the ZIP file. Use a clear name, such as Thunderbird_Profile_Backup_2026-05-04.zip. Future you will appreciate the date. Future you is already busy.

Once the export finishes, you will have a ZIP file containing your Thunderbird profile data. Store this file somewhere safe. Ideally, keep at least two copies: one on your computer and one on an external drive or secure cloud storage. A backup that lives only on the same laptop as the original data is not a backup; it is a roommate.

Important Limitation: Large Profiles

Thunderbird’s built-in Export tool is convenient, but it may not be suitable for very large profiles. If your profile is larger than the supported ZIP export size, you should manually copy the profile folder instead. This is still easy, but it requires a little more care.

How to Manually Back Up a Large Thunderbird Profile

1. Open Thunderbird.
2. Go to Help > Troubleshooting Information.
3. Find the Profile Folder row.
4. Click Open Folder, Show in Finder, or Open Directory, depending on your operating system.
5. Close Thunderbird completely before copying files.
6. Go one level above the profile folder.
7. Copy the full profile folder to your backup destination.

Closing Thunderbird before copying the profile is important because active files can change while the program is running. Copying an open profile is a little like taking a family photo while everyone is sprinting through the kitchen. Something may blur.

Where Thunderbird Profiles Are Usually Stored

If Thunderbird will not open, you can still find your profile folder manually. Common profile locations include:

• Windows: %APPDATA%ThunderbirdProfiles
• macOS: ~/Library/Thunderbird/Profiles/
• Linux: ~/.thunderbird/

On Windows, the AppData folder is hidden by default, so using the Run box is often faster. Press Windows + R, type %APPDATA%ThunderbirdProfiles, and press Enter. On macOS, you may need to hold the Option key while opening the Finder Go menu to reveal the Library folder.

Pros and Cons of the Built-In Export Tool

Pros: It is built into Thunderbird, easy to use, and great for full backups. It keeps your mail and settings together, making it convenient for migration.

Cons: It is not ideal when you only need a few folders or messages. It also creates a profile-style backup rather than a neatly organized set of readable email files. If you want PDFs, EML files, or a folder-by-folder export, Method 2 is usually better.

Method 2: Export Thunderbird Mail with ImportExportTools NG

If Thunderbird’s built-in Export tool is a moving box, ImportExportTools NG is a full packing station with labels, bubble wrap, and suspiciously satisfying checkboxes. This add-on gives you more export options for messages, folders, search results, and profiles.

ImportExportTools NG can export messages and folders in several useful formats, including EML, MBOX, HTML, PDF, CSV, and plain text. It can also export indexes, include attachments in certain workflows, and handle individual messages or entire folders. This makes it especially useful for people who need readable archives outside Thunderbird.

Best For

• Exporting selected Thunderbird folders
• Saving individual messages as EML files
• Creating PDF or HTML copies for easy reading
• Exporting search results
• Building organized archives for work, school, taxes, or records

Step-by-Step: Install ImportExportTools NG

1. Open Thunderbird.
2. Click the menu button.
3. Go to Add-ons and Themes.
4. Select Extensions.
5. Search for ImportExportTools NG.
6. Click Install.
7. Restart Thunderbird if prompted.

Always install Thunderbird extensions from the official Thunderbird add-ons area when possible. Random download sites may promise magical email powers, but your inbox deserves better than mystery software wearing a fake mustache.

Export a Thunderbird Folder with ImportExportTools NG

1. In Thunderbird, right-click the folder you want to export.
2. Choose ImportExportTools NG.
3. Select the export option that matches your goal.
4. Choose whether to export the folder as MBOX or export messages as individual files.
5. Select a destination folder on your computer.
6. Confirm the export and wait for the process to finish.

For example, suppose you have a Thunderbird folder named Invoices 2025. If you want to preserve it for long-term storage, exporting the folder as MBOX keeps the folder structure suitable for future import into compatible email clients. If you want easy human-readable copies, exporting messages as PDF or HTML may be more convenient.

Export Selected Messages

Sometimes you do not need a full folder. Maybe you only need a few messages from a client, a receipt for a laptop, or your friend’s legendary chili recipe that somehow arrived with the subject line “Quarterly Budget Review.” ImportExportTools NG lets you export selected messages instead of the entire mailbox.

1. Open the folder that contains the messages.
2. Select one or more emails.
3. Right-click the selected messages.
4. Choose ImportExportTools NG.
5. Select your preferred export format.
6. Save the files to a clearly named folder.

For long-term access, EML is often a practical choice because it preserves the message in a standard email-style file. PDF is useful when you want easy viewing or sharing, but it is less flexible if you later want to re-import mail into another email client.

Which Export Format Should You Choose?

Choosing the right format depends on your goal. Here is a simple breakdown:

• MBOX: Best for preserving folders and importing into compatible email clients later.
• EML: Best for saving individual emails while keeping message structure.
• PDF: Best for readable records, printing, or sharing with someone who does not use Thunderbird.
• HTML: Best for browser-readable archives.
• CSV: Best for indexes, lists, or spreadsheet-style review.
• Plain text: Best for simple message content without fancy formatting.

If you are exporting mail for backup, MBOX or EML is usually more useful. If you are exporting mail for reading, printing, or attaching to a report, PDF or HTML may be better. If you are exporting for analysis, CSV indexes can help you sort message subjects, senders, and dates without opening every email one by one.

Built-In Export vs. ImportExportTools NG: Which Is Better?

The best method depends on your mission. If your goal is “I want my entire Thunderbird life packed safely into one backup,” use the built-in Export tool. If your goal is “I need these exact folders in readable files,” use ImportExportTools NG.

Use the Built-In Export Tool When:

• You are moving to a new computer.
• You want to back up the whole Thunderbird profile.
• You want to preserve accounts, settings, address books, and messages together.
• You prefer a simple, official option with fewer choices.

Use ImportExportTools NG When:

• You want to export only certain folders.
• You need EML, PDF, HTML, CSV, text, or MBOX output.
• You want readable copies of important emails.
• You are organizing records by year, client, project, or account.

In many real situations, the smartest answer is to use both. Create a full Thunderbird profile backup first, then export selected folders in readable formats. That way, you have a complete recovery option and a practical archive you can browse without restoring Thunderbird.

Common Mistakes to Avoid When Exporting Thunderbird Mail

Exporting Before Mail Finishes Downloading

If Thunderbird has not fully downloaded your IMAP messages, your export may not include everything you expect. Open important folders, check older messages, and confirm attachments are available before exporting.

Saving Backups Only on the Same Computer

A backup stored on the same drive as the original is vulnerable to the same failure. Save a copy on an external drive or secure cloud storage. The goal is redundancy, not just decoration.

Using Vague File Names

Names like backup.zip, email old final final 2.zip, and stuff.zip are future confusion machines. Use descriptive names with dates, such as Thunderbird_Work_Email_Backup_2026-05-04.zip.

Forgetting to Test the Export

After exporting, open a few files or inspect the folder structure. A backup is only useful if it actually works. You do not need to test every message, but you should confirm that the export completed and contains what you expected.

Assuming PDF Is Always Best

PDF is easy to read, but it is not always the best archive format. If you want to re-import emails later, EML or MBOX may be better. PDF is excellent for viewing and sharing, but email data is usually more flexible in email-native formats.

Practical Example: Exporting Thunderbird Mail for a New Laptop

Imagine you are replacing your old Windows laptop. You want Thunderbird on the new machine to look and behave like the old one. In this case, start with Method 1. Use Thunderbird’s built-in Export tool to create a ZIP backup of your profile. Save that file to an external drive. On the new laptop, install Thunderbird, then use the import or restore process to bring your profile back.

Now imagine you also have a folder called Tax Receipts. You want readable copies outside Thunderbird, just in case. Use Method 2 to export that folder as PDF or EML files. Store those files in a separate folder named Tax_Receipts_Email_Archive. Congratulations: you now have both a full Thunderbird backup and a practical record archive. Your inbox may still be chaotic, but your backup strategy is wearing a tiny graduation cap.

Practical Example: Exporting Thunderbird Mail for Work Records

Suppose you manage freelance projects and keep client conversations in Thunderbird folders. You may not need to export your entire profile every time a project ends. Instead, create a folder for the project, move all relevant emails into it, and use ImportExportTools NG to export that folder.

For long-term storage, export as MBOX or EML. For quick review, export as PDF or HTML. If you need a message list, export an index in CSV format. This gives you a clean archive that can be stored with contracts, invoices, project files, and notes. It also prevents the classic problem of searching your inbox months later using keywords like “that one thing from Dave.” Dave sent 413 emails. Dave is not helping.

of Real-World Experience: What Exporting Thunderbird Mail Teaches You

After working through Thunderbird exports many times, one lesson stands out: email organization feels boring until the exact moment you urgently need one message from three years ago. Then it becomes the most exciting detective story of your week. Exporting Thunderbird mail is not just a technical task; it is a small act of future-proofing your digital life.

The best experience comes from treating exports like regular maintenance instead of emergency surgery. If you wait until a laptop is failing, Thunderbird is crashing, or a deadline is breathing dramatically over your shoulder, the process feels stressful. If you export once a month or before major changes, it feels calm and routine. A simple folder named Email Backups, with dated subfolders, can make the whole system feel less mysterious.

Another useful habit is separating full backups from readable archives. A full Thunderbird profile backup is great for restoring your setup, but it is not always convenient when you only want to read one message quickly. That is why combining the built-in Export tool with ImportExportTools NG works so well. The profile ZIP gives you recovery power. The EML, PDF, HTML, or MBOX exports give you day-to-day convenience.

For people with large inboxes, folder planning matters. Before exporting, create logical folders such as Clients, Receipts, Travel, School, Family, or Old Projects. Then export those folders separately. Smaller exports are easier to verify, easier to move, and easier to restore. They also reduce the risk of creating one giant archive that nobody wants to open because it looks like it contains the entire history of civilization.

File names are another underrated detail. A good file name should answer three questions: what is it, whose mail is it, and when was it exported? For example, Thunderbird_Personal_Inbox_Export_2026-05-04 is much better than newbackup. Clear naming saves time and prevents duplicate confusion.

Testing the export is equally important. Open a few exported messages, check attachments, and make sure folder names look right. If you exported to PDF, open several files. If you exported to EML, test one with an email client. If you exported MBOX, keep notes about which folder it came from. You do not need to become an email archivist wearing white gloves, but you should verify enough to trust the result.

Finally, remember that exporting Thunderbird mail is not only about disasters. It is also about freedom. When your emails are backed up and organized, you are less dependent on one device, one installation, or one account setup. You can upgrade computers, clean old mail, preserve important records, and sleep a little better. The inbox may never become perfect, but with a smart export routine, it becomes manageable. And manageable is a beautiful word when your email count has more digits than your phone battery percentage.

Conclusion

Learning how to export Thunderbird mail is one of those practical skills that pays off quietly. You may not need your backup today, tomorrow, or even next month. But when you do need it, you will be very glad you created it.

For a complete backup, use Thunderbird’s built-in Export tool. It is simple, official, and ideal for preserving your whole profile. For flexible exports, use ImportExportTools NG. It gives you more control over folders, messages, file formats, indexes, and readable archives.

The safest approach is often a combination: export the full Thunderbird profile for recovery, then export important folders separately in formats you can easily open. Add clear file names, store copies in more than one location, and test your exports before calling the job done. Your future self may not send you a thank-you card, but they absolutely should.