How to Convert OST to EML File Format? Easy Methods

Written By
Abhishek Singh

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Updated on
November 28, 2025

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6 minutes Read

Summary: When using Microsoft Outlook, all your emails, contacts, calendars, tasks, and other data are stored in an OST file. Since an OST works well within Outlook, it becomes difficult to access it outside Outlook. Meanwhile, EML files can be viewed in almost any email client or browser, which makes them perfect for sharing. In this blog post, we will explain trusted methods to convert OST to EML manually and professionally. Additionally, we will also share how the automated MacSonik OST to PST Converter Tool can safely and accurately complete the entire process.

Why Users Choose to Convert OST Files to EML?

Users may want to export their Outlook OST files to EML for many helpful reasons:

• EML files can be opened easily using many apps like Thunderbird, Windows Mail, Outlook Express, or even browsers.
• EML files are very small in size, easily portable, and easy to share.
• It keeps all the emails’ original structure, including formatting and hyperlinks.
• EML files are not Outlook dependent; users don’t need Outlook installed to view their EML files.

Reliable Methods to Convert OST to EML

There are two simple ways to save an OST file into EML files:

• Manual Method: Complete conversion using Outlook features and built-in options.
• Professional Method: Using a dedicated, verified, and trustworthy tool for fast and secure results.

Manual Methods to Export Outlook OST Files to EML

Here are some basic, free, and simple manual techniques you can try. These work best for users who want to convert only a few emails.

Method 01 to Save OST File to EML

This method is suitable when you only want to convert selected emails.

1. First, open Microsoft Outlook on your Windows system.
2. Then, choose the email you want to export and open it.
3. After that, click on the File tab and select the Save As option.
4. From the list, select Text Only (.txt) or HTML (later saved as EML).
5. Save it to your desired location.
6. Finally, rename the file extension from .txt or .html to .eml.

Method 02 to Export OST to EML File

Second method to access a small number of OST emails in EML format:

1. Initially, launch the Outlook application and choose the email(s) you want to convert.
2. Afterwards, drag the selected emails to any folder on your PC.
3. Then, all the emails dragged will automatically save in .msg format.
4. Further, use Windows Mail or another email client and import/open the .msg file.
5. Once opened, save it again as .eml.

Limitations of Manual Methods

• Every email has to be converted individually, which becomes slow for large mailboxes.
• There is no option to bulk convert multiple OST folders, making it less efficient for professionals.
• Email formatting and attachments may not always be preserved like original files.
• Requires Outlook and additional steps, along with technical steps that can be difficult for beginners.

Professional Approach to Convert OST to EML

For professional users who find it difficult to complete highly reliable and accurate conversions, the MacSonik OST to PST Converter Tool is a perfect choice. The tool is specially crafted to work without any data loss and without compromising the email structure. It overcomes the limitations of manual conversion and easily handles multiple OST files at once. In addition to the OST to EML conversion, other features such as duplicate remover, date filters, attachment settings, and more. The tool provides various options such as convert OST to MBOX, PST, PDF, EMLX, and other file formats.

Steps to Professionally Export OST to EML

1. First, open the OST Converter Tool on your system and click Next.

2. Then, click Select Files to browse and Open the OST file in the software, and click Next.

3. After that, choose the folders/emails you want to convert, preview them, and click Next.

4. After that, select the EML option from the File Format options.

5. Apply the filters you need and choose the final saving path.

6. Finally, click Convert to begin the process.

Why Choose the OST Converter Tool?

Conclusion

All things considered, there are manual methods as well as professional tool to convert OST to EML format. We have discussed the best approaches to complete the conversions that give 100% accurate and safe results. Users can use the manual method for small conversions or individual purposes. However, for bulk or large mailbox conversions, it’s highly recommended to use the professional OST Converter Tool. The tool generates fast, safe, and accurate results, setting a benchmark. Additionally, the tool provides various advanced features and filters, even in its demo version.

Frequently Asked Questions

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