Emails remain the primary medium for communication in the digital workplace today. When users migrate between different platforms such as Thunderbird, Apple Mail or Windows Live Mail to the Microsoft ecosystem, they face the problem of file compatibility. This is one of the main reasons users ask how to import EML to Outlook without data loss. 

Before looking at the methods to import EML, lets see how does the classic Outlook and the New Outlook import EML.

The Classic Outlook: Desktop App

It is quite flexible for email migration as it treats EML files as standard objects and allows for easy local management.

It uses a local MAPI architecture, that means it can read EML files from your hard drive and move them into a local PST or an IMAP or Exchange folder without a server connection. 

Direct Open: To open it directly you can right-click any EML file and select Open With > Outlook Classic to view it.

Drag and Drop Method: By selecting multiple EML files in Windows File Explorer and dragging them into an existing folder in your Outlook sidebar.

The New Outlook: Windows Application

The New Outlook is different from the Classic version as it treats your Microsoft Cloud account as the primary file format. You must upload your data to the cloud so that it can be synced on various devices as it does not support offline import. 

It has a 14MB limit per EML file so the large files will fail to upload. 

If your EML files are organized in subfolders, you have to import each folder one by one as the importer only sees top-level files.

Dragging an EML file opens the reading pane but it does not save it to your mailbox.

What is EML?

EML is the standard format for individual email messages, but Microsoft Outlook uses the PST (Personal Storage Table) format. If you are struggling with this, then here you will get every important step to import EML to Outlook while ensuring that your Metadata and attachments remain in place by using both the manual and the automated tools like the SysTools EML to PST Converter Tool, which helps you to convert the EML file to PST format.

Method 1: The Drag-and-Drop Method 

This method works for the Classic Outlook and only works if you have a small number of files and want to import EML to Outlook using basic features.

Steps to Import EML to Outlook:

1. Open Microsoft Outlook on your computer.

2. Locate the folder where your EML files are stored.

3. Select the EML files that you want to move.

4. Drag the selected files and drop them into an Outlook folder like the Inbox.

This method is a quick way to import EML to Outlook but it is not suitable for large attachments as it can be disconnected during the move.

Method 2: Using Windows Live Mail to Import EML to Outlook

Windows Live Mail was a popular way to import EML files to Outlook 365 indirectly. This can act as an intermediary for the users who still use the Classic Outlook (2010, 2013, 2016) version.

Step-by-Step Explanation:

1. Launch both Windows Live Mail and Microsoft Outlook on the same device.

2. In Windows Live Mail click the File menu, select Export and then choose Email Messages.

3. Select Microsoft Exchange as the format and click on Next.

4. A message will appear saying that all emails will be exported to Outlook, then click OK.

5. Select the folders you want to move and click OK again.

This method can include a lot of bugs as Windows Live Mail is reaching the end of its life. So if someone wants to understand how to import EML to Outlook without data loss, you must look for some modern and stable solutions.

Method 3: The Professional Choice 

The SysTools EML Converter Tool is designed to handle the email structures that the manual methods ignore and that is the reason why it is the industry standard for this task. .

This tool ensures that every bit of data, from the hidden header information to the attachments, is perfectly protected.

Why This is the Best Way to Import EML to Outlook:

• Batch Import: It can import thousands of files together which can be later converted into other formats, a task that the manual methods cannot handle.

• Maintain Folder Hierarchy: It keeps your Inbox, Sent and Draft folders at the same location that they were in the original client.

• Metadata Preservation: It ensures that BCC, CC and Sent Date remain unchanged, which is important for legal and corporate issues.

• Direct Migration: It allows you to import EML files to Outlook Web and Office 365  using administrative details.

Steps to Use This Tool

1. Download: Open it on your system.

2. Add Files: Click on Add File to download your EML data into the software.

3. Preview Data: This tool provides a 7-mode preview to verify data.

4. Select the Export Format: Choose the PST format to ensure that the files are ready for Microsoft Outlook.

5. Apply Filters: You can use the Date Filter to migrate specific emails 

6. Convert: Hit the Export button to generate the file.

Method 4: How to Import EML Files to Outlook Web

Many users prefer the web version of Outlook, and the process to import EML files to Outlook Web is a little different. You cannot directly import a file into a browser window as easily as a desktop application, so you have two options:

1. Connect your Desktop Outlook with your OWA account.

2. Use a professional tool to upload the data directly to the cloud.

The process to import EML to Outlook without data loss on a web requires you to ensure that the IMA or Office 365 connection is completed before your browser.

Note: If you want to know How to Import EML Files in Apple Mails, then you can try this.

The Limitations of Manual Methods

The manual methods are free but they have certain risks. You should be aware of the common risks if you are searching for how to import EML to Outlook without data loss:

• Missing Metadata: The Date field changes to the Date of Import rather than the Date Sent.

• Broken Images: Images in the email body usually look as broken links.

• Size Restrictions: Outlook pauses when it drags more than 50–100 EML files.

• No Web Support: Without a desktop intermediary it is impossible to import EML files to Outlook Web manually.

Conclusion: The Best Strategy

All the evidence suggests that you should use a professional tool if you are looking to import EML to Outlook without data loss. The manual methods fall short in some or the other area.

The professional tool allows you to import EML to Outlook with your headers and attachments and they remain where they were. Following the steps mentioned here will ensure a smooth and error-free process whether you want to import EML files to Outlook 365 or simply to Outlook Web.