-
Written By
Simran Bhatia -
Approved By
Sonika Rawat -
Updated on
April 13th, 2026 -
Read Time
9 minutes
“My friend Roger used to work on Mozilla Thunderbird, and he saved approx 150+ EML files from it. Those individual electronic mail messages contain crucial data for an upcoming audit. Also, the data is to be shared with a few clients over the Kerio Connect server, and he is unsure of how to do so. I am looking for any help. If anyone can suggest how to import his EML files on the Kerio server without losses.”
-Marcus Willington, California Spree
Every user working with Kerio Connect is quite aware of the fact that it supports EML files. However, what if you need to import EML to Kerio Connect from another EML-supported server like Thunderbird, Apple Mail, Outlook, etc? It can be for any reason, say, you are archiving emails, migrating your mailbox data, recovering historical archives, and so on. Whatever the case may be, this guide can help you with a smooth import for free or using an advanced SysInfo EML Converter Tool for the best results in minimal time.
Well, there’s a direct connection between the EML file and Kerio Connect as-
Kerio Connect is a centralized server environment storing all the emails, contacts, calendars, tasks, and other data as a separate EML file. And each .eml file is stored inside a #msgs folder stored inside a mail directory.
Now, EML is the standard format, and it ensures that all email headers, metadata, HTML formatting, attachments, etc., are preserved. When you import EML data into it, this means you have placed the data in the correct server folder for recognition and simplified access, even in the near future. So, in all, it is beneficial to make the import, but you must ensure some checks before the import.
You can follow some simple manual approaches, or download the converter tool to make an instant import. Use these approaches with the specified steps, along with their advantages and limitations, for better decision-making.
Let’s dive into three different solutions for a flawless transfer of the mailbox data with ease. These are explained as follows:
It is one of the most direct solutions, but you must have access to the server file system, which is usually possible if you are a system administrator. So, this method is for you; just ensure to take a backup of your Kerio store directory before beginning here. The steps to follow are:
|
Note: When you import EML to Kerio Connect, the Kerio Connect server must be stopped before the copying of files. If it’s left running, you can face synchronization issues or data corruption. |
If you have a small number of EML files for the import and you are ready with the Kerio Connect credentials and access, then continue with these steps:
In case you have a few files with critical data and access to your server system, then using a mediator client like Mozilla Thunderbird, you can import files via IMAP. Follow these steps:
Dealing with thousands or more EML files and complex folder structures makes it essential for a smart solution like SysInfo EML Converter to exist. It allows all professionals, end users, businesses, and enterprises to make imports with zero downtime and no loss. Experts trust it as an ideal solution for data migration with full integrity and folder structure preservation during batch imports in minimal time. Moreover, the software is available for all OS versions, whether Windows or Mac, and supports a Demo for assurance and user satisfaction.





Client Testimonial:
“My organization had more than 500 .eml files that we needed to upload to the Kerio Connect server, but none of the manual methods were sufficient. Using the SysInfo EML File Converter Tool allowed us to instantly import EML files to Kerio Connect with zero loss and no performance issues. Its user-friendly interface even allowed us to operate smoothly, and we were able to work effortlessly.”
It is quite a straightforward task to import EML to Kerio Connect using the free or paid methods provided in this guide. With the right approach, the import becomes easy, and the data remains secure. For a few files, use any of the manual methods that you find a perfect fit. However, in the case of enterprise critical datasets, choose the SysInfo EML to Kerio Import Tool, which allows offline processing and effortless imports at minimal cost and time, accurately and precisely.
Ans. To import EML files to Kerio easily, use either the manual IMAP route via Thunderbird or the automated EML Import Tool. Both methods are suitable, tested, and verified, and will give you the desired results.
Ans. The best way for bulk EML transfers to Kerio Connect is using the EML File Import Tool by SysInfo. It allows adding multiple files and in batches without any size limitations.
Ans. Yes, of course. The attachments remain intact during the EML to Kerio Connect import when done with the specialized import tool. It helps ensure that not only emails, but attachments are accessible too, without flaws.
Ans. You must opt for a professional EML to Kerio Connect Import Software for these reasons:
1. Ensure data fidelity and structure preservations
2. Handles error consistently, and no data loss happens
3. Syncs data quickly to the account and allows a preview
4. Offers pilot tests and free import of upto 50 emails
5. Maintains 100% accuracy and requires no external application
Ans. Using a smart EML Converter by SysInfo, you can ensure zero downtime during the import. It has fast syncs, direct OAuth authentication to the destination client, and an option to skip previously migrated data, which makes it a perfect fit.
About The Author:
Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms.
Related Post