How to Convert EML Files into MBOX: Smooth and Easy Way

Nov 26, 2025 - John Maxwell

Introduction

If you are a working professional, you may know the importance of sending and receiving emails on a daily basis. Emails play a very significant role in our daily life whether it be in a professional setting, banking and financial setting or just for personal communication. But the problem comes when you need to organize all of your emails in their own respective email clients. While it may sound strange to organize all the email clients in one single folder, there is indeed one solution, i.e. MBOX format. MBOX format files are the file format, which contains mails from multiple emails clients in one single file, regardless of their email clients.

But due to the complex nature of email clients and their working, most people don’t understand the process of converting their EML files into MBOX format. In this blog, we are going to tell you the same. But let’s first understand some of the other significant reasons why someone would need to convert their EML files into MBOX format.

Major Reasons to Convert EML Messages to MBOX Format

1. Instead of making multiple files for each email client, MBOX keeps all your emails together in one big file, which makes organizing easier.

2. MBOX is very compatible in terms of email clients. Many email apps (Thunderbird, Apple Mail, etc.) prefer MBOX, so it’s easier to import everything at once.

3. MBOX is great for backups because you only need to store one file instead of many little ones.

4. Migrating to another email app becomes simpler, since most clients understand MBOX.

5. Searching through messages is easier when they’re all grouped in a single MBOX file.

6. MBOX works better for archiving old emails long-term.

7. Some tools only support MBOX for import/export, so converting avoids compatibility issues.

8. MBOX reduces the chance of losing individual emails because everything lives inside one container.

Methods to Convert EML files into MBOX format

There are usually two methods to convert your EML files into MBOX format, i.e. manual and automatic method.

EML to MBOX Conversion using Manual Method

In the manual method, you are expected to do the whole process yourself. You have to perform each and every step. Manual methods often do not require any third-party installation.

Here’s how to convert EML files into MBOX format.

1. Install and open Mozilla Thunderbird.

2. Create a new folder inside Thunderbird.

3. Select your EML files from your computer.

4. Drag and drop them into the new Thunderbird folder.

5. Install the ImportExportTools NG add-on (free).

6. Right-click the folder → ImportExportTools NG → Export folder → save it as MBOX. 

Convert EML to MBOX Format- Automated Solution

In the automatic method, you are expected to download third-party software. It is simple, easy and convenient. Additionally, automatic methods provide some of the best features in the market. 

Since an automatic method requires you to download a third-party software, here we are going to take the example of TrustVare EML to MBOX Converter, one of the highly regarded tools in the market. 

How it Works

1. Download and install TrustVare EML to MBOX Converter on your device. 

2. Browse the EML files on your device.

3. Select all the EML files you wish to convert. (You can select multiple files at once via bulk conversion.)

4. Click on Convert. You will be prompted to multiple conversion options.

5. Click MBOX from the options.

Why People Prefer Automatic Method over Manual Method of Conversion

There can absolutely be various reasons for why one would prefer an automatic method of conversion over a manual method.

1. As in the manual method you have to do every single thing by yourself, it increases the risk of human errors. But in the case of an automatic method, all the process is done by the tool with minimal clicks required. Reducing the chances of human errors on a very big scale.

2. Compared to manual methods, automatic methods are way faster. Along with that, the bulk conversion feature makes the process faster by converting multiple files at one time.

3. A lot of efficient third-party tools provide the preview feature, so you can see all your files even before converting them. But in the case of manual methods, you have to rely on your gut feeling..

4. The manual method you are performing may be useful for one version of Windows or the email client, but may not work for other versions. On the other hand, most of the automatic tools are cross-platform compatible.

5. In robust software, you do not need multiple tools to convert your files’ format. 

Conclusion

We understand there can be various reasons for converting your EML emails into MBOX format. It can be due to any reason like switching to another email client or accessing your emails without the internet or any other. Indeed, the manual methods exist, but they are lengthy, complex and have their own drawbacks. But an automatic tool comes with some of the best features. It makes the whole process convenient and simple. 

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