How to Import EML Files into Microsoft Office 365 ?

Leena Taylor Paul
Updated: May 15, 2026 • Import • 6 Min Read

Summary: You can import EML files to Office 365 using a dedicated EML to Office 365 importer tool. The tool reads all your EML files and uploads them directly to your Office 365 mailbox via IMAP or OAuth. All emails, attachments, and metadata are preserved. No manual uploading or forwarding is needed.

To import EML files to Office 365, you need a method that bridges the gap between the EML format and the Microsoft 365 mailbox. Office 365 does not accept EML uploads directly through the web interface. A dedicated EML to Office 365 importer tool handles bulk migration reliably.

Reasons to Import EML Files to Office 365

There can be several reasons when a user needs to perform such a task. As we all know, Microsoft Office 365 is the widely used and popular cloud application. It offers so many features instead of other apps like:

Your data saved in the cloud so you can access it anytime, anywhere.
You can easily share your files with somebody else by sending them links.
You can make a group with your friends to edit your files
We can use this for personal and business use (Nowadays, most of the users are using it for business use whether it’s a small business or big)

Above we have explained some benefits of Microsoft 365 account. Let’s return to your problem and try to solve it.

There is no manual solution to import EML to Office 365. So, the only option is left to use a third party solution. We will offer you the solution which can reduce your stress and can do your task in less than a minute.

Best solution to import EML files to Microsoft 365

The best and advanced solution available is 4n6 Email Converter. This tool is very reliable and can make your task easy. This application is very help in importing EML files along with all the attached properties. Let’s go through what this tool can do for you.

Qualities of the EML to Office 365 importer tool

The interface of this application is very friendly. You can use it with any technical assistance
The tool allows you to import unlimited EML files to Microsoft 365 directly.
Capable to import EML files into Microsoft Office 365 along with attachments.
While importing EML files into Office 365, the tool maintains all properties.
You don’t need to install any supportive application to accomplish this task.
EML to Office 365 Import Tool provides the complete preview of emails as well as attachments.
You can search for your emails on this application. This application allows you to search for your files of a particular time and period and of particular email addresses.
This application allows you to extract your important files from the email account. So if you are in need of all the attachments from a single account you can easily extract them from the extract tab.
This application allows you to save multiple files with a single click. This tool has no limitation to select the number of files. You can select as many you want.

These are some highlighted features of the application. If you find this app useful and need to use it to complete your task, you must know how to do this. Now, we will provide you the steps by which you can easily import EML files.

Process of importing EML files into Office 365 account

Firstly, download the software on your machine.
After running the application
Go to open tab and then,
Click on email data files and select EML files
After selecting the EML files chose folders all files from the system
The tool then displays all the folders
Now, go to Export tab and select Office 365 as an email service
Enter your Office 365 email address and password to which you want to import your data
Now go to Save option and click on it.

This is the overall process, which you need to follow. Have you find this tool valuable to you? If yes, then kindly share it with your friends.

Final words

In this article, we have provided a complete solution to import EML files to Office 365. We helped you to overcome this problem with the help of most trusted third-party tool. If you find this article useful, please tell us. Kindly give us suggestion.

Common Errors When Importing EML Files to Office 365

Office 365 does not accept EML file uploads directly: This is expected. Use a dedicated EML to Office 365 importer tool that connects via IMAP or OAuth to upload your EML files.
OAuth or IMAP authentication fails: Ensure IMAP is enabled for your Office 365 account. If your organization has disabled basic authentication, use OAuth (modern authentication) in your importer tool.
Import stops before completing: Microsoft throttles IMAP connections for large uploads. Use incremental import mode so the tool resumes from the last successfully imported EML file.
Emails appear in wrong folders in Office 365: Configure folder mapping in your importer tool before starting. This ensures EML files from different source folders land in the correct Office 365 folders.

FAQ: Importing EML Files to Office 365

Can I import EML files into Office 365 without Outlook installed? Yes. A standalone importer tool connects to Office 365 directly and uploads EML files without needing Outlook on your PC.
Can I import hundreds of EML files into Office 365 at once? Yes. A batch importer processes a folder of EML files and uploads them all to Office 365 in a single operation.
Will attachments in EML files be preserved in Office 365? Yes. A good importer tool transfers all email attachments to Office 365 along with the message content.
Can I import EML files from Thunderbird or Windows Live Mail into Office 365? Yes. Export emails from those clients as EML files, then use an EML to Office 365 importer to upload them.
Will the import preserve original email dates? Yes. A good importer tool preserves the original send and receive dates of each email during the upload to Office 365.