Need to unlock the contents of your OST file and access them as shareable, normal EML files? You're in search of a best solution. Outlook's OST format keeps things convenient offline, but for wider compatibility with clients such as Thunderbird and Windows Live Mail, EML is the answer. Here's the inside scoop on how to make that conversion smoothly and without data loss.

Why Open OST file as EML?

• Read emails independent of the original Outlook profile or Exchange relationship.

• Open and view OST data in other email clients that support the standard EML format (such as Thunderbird).

• EML is a less complex format for personal email storage and management.

• Makes it easier to transfer emails to other email clients that mainly use EML.

• EML files are more widely accessible for sharing and porting individual emails.

• EML is usually used for examining single emails in investigations.

• Extract data from an OST file when the associated Exchange account is inactive.

Now, move towards manual solution part, where users can convert OST file as EML format using Microsoft Outlook.

Method 1. View OST as EML using Microsoft Outlook

• Begin by opening Microsoft Outlook with your OST profile already loaded.

• Choose the emails to convert and drag them into a folder on your desktop—this saves them as MSG files.

• Open Mozilla Thunderbird on your computer.

• Drag and drop the MSG files on your desktop into Thunderbird's message list directly.

• Once emails show up in Thunderbird, right-click on each email, select "Save As," and choose EML as the file type to save your emails in EML format.

Shortcoming of Microsoft Outlook Method

• Requires Outlook to be running and connected to the original OST file.

• Not suitable for converting large batches or the entire mailbox.

• Drag-and-drop can cause loss of email formatting and metadata

Method 2. Professional Way to Batch Convert OST to EML format

BitRecover OST Converter Wizard is a flexible tool for exporting Outlook OST files to EML and numerous other formats, capable of handling both the newest and oldest versions of Outlook. The software ensures that all email properties, attachments, and folder structures are retained during the conversion process. Equipped with an easy-to-use interface, it appeals to both novice and experienced users, as it is simple to use without requiring technical knowledge. Along with EML, one can directly export OST data to Office 365, Gmail, Yahoo Mail, and other general email clients.

Key Steps to View OST as EML format

• Download and install BitRecover OST to EML Converter on your Windows or Mac system.

• Run the software, which can automatically scan OST files from your Outlook account, or manually add OST files or folders as required.

• The software shows all accessible OST folders—choose all folders or only those that you wish to convert.

• Choose EML from the list of saving options as your preferred output format.

• Choose a file naming convention to organize your EML files in a way that fits your needs.

• Set the destination folder for your converted files, or use the default desktop location, then click Next to start the process.

• The conversion will begin and generally completes quickly, even with large files.

• When finished, you’ll see a confirmation message and the tool will open the folder containing your new EML files automatically.

• You can now use and view your extracted EML files from the destination location—no further action required.

Conclusion

Converting OST to EML makes your emails viewable in more email clients and easier to share or migrate. Manual processes are suitable for a handful of emails but can be tedious and may lose formatting. Professional software such as OST to EML Converter processes batches in great numbers, preserve all attachments and metadata intact, and do not need Outlook installed. 

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