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How to Batch Convert EML to MBOX Format? 2026 Guide

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How to Convert EML to MBOX File?

To save EML as MBOX file, you have to first import the email files into Thunderbird and then either use the ImportExportTools NG to export those files in MBOX or navigate to the Thunderbird local profile where these imported EMLs are saved and then change their extension to .mbox.

Apart from this, you can also configure Gmail in Thunderbird with IMAP settings, import those EML files into a local folder of Thunderbird, let the data sync, and then use Google Takeout to export them in MBOX format. Over and above that, macOS users can use Apple Mail to import the email files and then export them in MBOX format using the built-in options only.

However, all of these have some limitations and that is why the best way to convert EML to MBOX format is a dedicated EML to MBOX converter software. They are developed with various modern features to fulfill user requirements and give around-the-clock support to ensure a swift conversion experience.

Common Reasons to Export EML to MBOX

• As compared to EML, MBOX files are best suited to manage a large collection of emails easily, as the need to organize hundreds of emails in individual files is eliminated.
• Another reason behind this conversion is that MBOX files are very compatible with many prominent email platforms and therefore, working with them becomes easier.
• Switching the email client from an EML-based to an MBOX-supported platform also turns out to be quick and accurate if a user saves EML files to MBOX format.
• In addition to that, to archive batch EML files in an easy-to-organize, find, and share format, MBOX is the right choice.

Manual Ways to Convert EML to MBOX on Windows and Mac

There are four tried-and-tested manual methods for EML to MBOX conversion. So, let’s dig in and learn about each one of them in detail along with step-by-step process.

1. Using ImportExportTools NG in Thunderbird

Using Thunderbird with its ImportExportTools NG plug-in is best suited for Windows users who want a simple and straightforward solution.

1. Install and run Thunderbird on your device.
2. Configure an account in it to access all the options.
3. Now, go to the Local Folders section in the left panel and right-click there.
4. Then, from the drop-down, select New Folder and create one.
5. Once done, navigate to the locally saved EML files and select them.
6. Further, drag and drop them into the newly created folder to import them.
7. After this, click on three lines menu option and select Add-ons & Themes.
8. Next, search for ImportExportTools NG and add it to Thunderbird.
9. Further, go to the local folder where you have imported EML files and right-click.
10. Next, choose ImportExportTools NG and then choose the Folder Export (mbox) option.
11. Finally, choose the type of MBOX output you want, pick a saving destination, and click the Select Folder button to start the process to convert EML to MBOX format in bulk.

Warning: This is a dependent method, as the user must have Thunderbird and its plugin. Also, it does not support subfolders, as it only converts the folder you selected and nothing else.

2. By Changing Thunderbird Local Folder Extension

Using Thunderbird and changing the local profile folder’s file format is good for technical users since it has more steps and requires manual figuring out.

1. Again, the user has to first create a local folder and import EML to Thunderbird, as mentioned in the first method.
2. Once done, close the Thunderbird application completely.
3. Further, press the Win+R keys and paste this %APPDATA%\Thunderbird\Profiles\ to access the Thunderbird profile folder. Mac users have to go to this path.
4. Next, select the .default-release folder and click on Mail, then Local Folders.
5. After this, search for the folder name you just created in Thunderbird to contain the EML files.
6. When found, rename it with a .mbox extension at the end. For example, if you have created the folder with eml-import, then rename it to eml-import.mbox.
7. With this, you have successfully created an MBOX from an EML file on a Windows device.

Points to Consider: Make sure you create a copy of the EML folder and do not make changes to the original one. Also, even before renaming, those files have already been converted to MBOX, but giving it the extension in its name is important so that other platforms can easily recognize it as MBOX data.

Warning: The user has to separately search the sub-folders and rename them. Also, some users are unable to find their Thunderbird path due to the platform’s glitch and the technical process. In addition to that, the exact folder path given above might not be the same, depending on the Thunderbird version you are using.

3. Using Thunderbird, Gmail, and Google Takeout

Apart from this, using Thunderbird, Gmail, and Google Takeout is a great way for those who have been Gmail users for a long time and want the conversion to be done via Takeout. The steps to follow this solution are mentioned below.

1. First of all, configure your Gmail account in Thunderbird.
2. Then, right-click on your email ID and create a new folder there.
3. After this, import your locally saved XML files into it.
4. Once done, open Gmail and refresh it to check whether the new folder has synced successfully or not.
5. Further, go to takeout.google.com and log in with your Gmail account.
6. Then, deselect all the data and check the Mail option.
7. Now, click on All Mail Data Included. From there, deselect everything and check only the new folder with EML files. Click on OK to save the changes.
8. Further, scroll down and click on Next Step.
9. After this, select the file type, frequency, and size, and then click on the Create Export button.
10. Finally, open the received email in Gmail and click on Manage Google Takeout request to get the ZIP file of your MBOX emails. Finally, extract the ZIP to get the MBOX files converted from EML files.

Warning: There are multiple steps and platforms included in this method, which make it more prone to error. Also, the user must have a Gmail account and a stable internet connection to follow this solution. Apart from this, loss of structure, longer processing time, and server issues can also make it inefficient.

4. Use Apple Mail to Export EML files to MBOX

Last but not least, using Apple Mail is one of the best and simplest solutions for macOS users. The step-by-step guide for this solution is as follows:

1. Run Apple Mail on your macOS.
2. Click on Mailbox and select the New Mailbox option.
3. Then, choose On My Mac, name it, and click OK.
4. After this, find the EML files and open them in Apple Mail.
5. Now, select and drag and drop those EML files into the newly created folder.
6. Once done, select the new folder, click on the Mailbox option, and choose Export Mailbox.
7. Next, select a save location path and click on Choose.
8. Wait a while, and this will convert EML to MBOX on a Mac device.

Warning: This method is not appropriate for bulk conversion, as it slows down the system or might create damaged output. Also, the exported files are not easily recognizable in Finder, which makes reaching out to the output difficult.

Mistakes to Avoid While Converting EML to MBOX Format

• Exporting corrupted EML Files can affect the output preferences of the users, as the file becomes inaccessible.
• Importing emails multiple times can create duplication within the output results, and users might get confused.
• Wrong character encoding should be taken care of if the user wants to access their important data in its original form.
• If the export process of EML files is interrupted, the resulting files may be broken or not working due to multiple reasons.
• Missing any important attachments while exporting data can affect overall data management.

Dedicated Tool to Batch Convert EML Files to MBOX

To overcome all the manual methods’ drawbacks and generate a customized yet quality output with minimal effort, using a dedicated EML to MBOX Converter is the best solution. One such certified, advanced, and easy-to-use tool is the BitRecover EML Converter. It is a desktop-based utility that supports bulk files and ensures 100% data accuracy without any hassle. The solution offers a wide range of export options, which make it a one-stop tool to work with EML files effortlessly.

What Makes Offline EML to MBOX Converter So Reliable?

• It has dual selection modes to choose bulk or specific EML files and folders for conversion.
• The tool makes sure to preserve the originality and formatting of the file even after the conversion.
• A free demo version is also available to understand all the features of this EML to MBOX converter tool before getting the licensed version.
• This software is very fast in terms of generating quality output of batch data in minimal time.
• Users can also select the saving destination of the output data to easily access and organize it.
• It has multiple advanced filters as well to convert only the required EML to MBOX and get a decluttered output.
• Supports EML retrieved from any source to ensure smooth conversion compatibility.
• Virus-free and adware-free solution to provide data safety and distraction-free conversion.
• Advanced options like optimization settings, log reports, and counts of EML files per folder are also available.
• Around-the-clock customer support, feature customization, and remote certified services are also available.

Watch the Complete Video Tutorial to Quickly Convert EML to MBOX

How to Convert EML to MBOX with Tool? Simple Steps

After downloading the suggested software, anyone can easily bulk convert EML files into a single MBOX file by following a few simple steps as given below.

1. Run EML to MBOX Converter and choose one option from Select Files or Select Folder to load .eml files in the software panel.
   
2. Now select all or the required emails from software panel and click on the Next button.
   
3. Select MBOX as the saving format, and if you want to change the destination path, then choose Destination path and your required file name; afterwards, press the Next button.
   
4. You can also select your required advanced filters to organize and convert your EML files into MBOX specifically.
   
5. Lastly, click on the Convert button to convert EML to MBOX in batch.
   

Manual vs Automated Approach: Clear Comparison

Final Words

We hope the above-mentioned methods were helpful for you to convert EML to MBOX. However, the EML to MBOX converter is really the best tool, as it is specially designed for such conversions in bulk. So it is helpful for users to save time and effort.

Before purchasing the tool, users can test it, as it comes with a free demo edition. One of the best features of this product is that it is compatible with all the latest as well as older Windows operating systems. The company provides a 30-day money-back guarantee in case of software failure.