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Written By Simran Bhatia
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Updated on October 10th, 2025
User Query: “I have hundreds of archived emails in EML format. I want to convert them into a single MBOX archive file to store and share on different systems for review. How can I convert my bulk EML files into MBOX?”
Summary: Have you ever found yourself with hundreds of emails saved as .eml files from different accounts or old mail clients? Figuring out what to do with them one at a time is especially annoying and tedious! The best way to handle this situation is to convert the EML files to a single, handy MBOX file. Also, convert EML to MBOX allows you to migrate from older email clients like Windows Mail to Thunderbird and Apple Mail. In this guide, we will use the manual solution and the EML File Converter Tool for this export.
The operations mentioned below make it easier to manage, transfer, or back up all emails together:
There are two manual methods to perform this export. Both methods are divided into multiple steps to reduce their complexity. However, these methods are too lengthy and need technical knowledge. You may face multiple errors during the process.
In this method, we are going to use Mozilla Thunderbird and use its ImportExportTools NG add-on. Follow the steps below carefully to avoid errors:
Here, we are combining multiple EML files into a single MBOX file by using Apple Mail. Apple Mail naturally supports the import of individual .eml files and export in .mbox format.
The CloudXena EML Converter is a highly secure and reliable solution to export your EML files into MBOX format without compromising data integrity. It ensures complete folder structure preservation, keeping your emails organized exactly as in the original mailbox. The tool also maintains email formatting, attachments, metadata, and headers throughout the conversion process. Moreover, it is efficient to convert EML file to CSV, PDF, MSG, DOC, DOCX, and so on.
Note that this excellent tool addresses the following “User Concerns”:
David had over 2,000 archived emails from his old Windows Live Mail application stored as .eml files. When he switched to Mozilla Thunderbird, he couldn’t import them directly.
He used the CloudXena EML Converter Tool to convert all his EML files into a single MBOX file, which he easily imported into Thunderbird.
As a result, all his old emails appeared in one place without losing formatting or attachments.
In this blog, we discussed multiple solutions to convert EML to MBOX, such as manual methods and advanced tools. If you have a larger file and want a quick solution, go with the automated tool. Manual methods are time-consuming, lengthy, and prone to errors. Also, we saw a real-life user case on how this tool works. For more queries, you can contact with Cloudxena tech support team.
Ans. Yes, manual conversion methods have a few limitations. They can be time-consuming, and manual methods may not preserve metadata. Using a professional EML to MBOX Converter Tool helps overcome these issues and ensures accuracy and speed.
Ans. Yes, if you use a reliable EML to MBOX converter, it preserves all email properties such as attachments, inline images, formatting, subject lines, and metadata.
About The Author:
I, Simran Bhatia am a Technical Content Writer specializing in data management, email migration, and data recovery IT solutions. My focus is on simplifying complex processes into clear, practical guides that combine technical accuracy with real-world value for IT admins, decision-makers, and everyday users. For me, writing is not just about explaining technology, it’s about making it accessible, reliable, and valuable for readers.
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