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Writer's pictureKapil Webbyacad Tech

Method to Convert OST Files to EML Format

Updated: Nov 25

In light of the significant divergences among various email platforms, individuals frequently encounter the need for reliable solutions to safely convert files between different formats. This necessity is particularly evident when it comes to converting OST files to EML format. Numerous Outlook users seek to convert their OST files into the widely recognized EML format, a process that can be accomplished through a blend of manual techniques and specialized tools. This article explores these file formats, offering in-depth guidance on effortlessly transforming OST emails into EML format, ensuring a seamless transition.

step by step guide convert OST file to EML
Convert OST file to EML Format

Understand OST and EML File Format


OST- The Offline Storage Table, commonly referred to as OST, is a file format employed by Microsoft Outlook to preserve user information in an offline repository. OST files serve as repositories for emails, tasks, contacts, notes, and calendar data, ensuring uninterrupted access to this information even in situations where internet connectivity is unavailable.


EML- An EML file represents an electronic message that encompasses a single email along with crucial details such as the message content, date, subject, sender/receiver information, and any attachments. This file format is supported by a multitude of email clients, including but not limited to MS Outlook, Thunderbird, Zoho Mail, Windows Live Mail, and Apple Mail.


Why Convert OST to EML


System Crash - Viruses targeting the MS Exchange server have the potential to trigger system crashes, leading to a cascade of errors within Outlook. This scenario can quickly escalate and result in numerous disruptions and issues.

Backup Needs - In case of any system failure or accidental deletion, users can take advantage of the different methods to take backup OST files in EML format.


Data sharing - Sharing OST files with others can be challenging, whereas using EML files simplifies and expedites the transfer process, facilitating seamless communication.


Switching to another Platform- As previously mentioned, the EML format boasts compatibility with multiple platforms, whereas OST files are primarily designed for Outlook. Consequently, conversion becomes imperative when transferring data to an alternative email client.


Way to Convert OST File to EML Format


The process of converting OST to EML format can be undertaken in two scenarios:


  1. When the OST file is actively connected to the Exchange Server.

  2. When the OST file is not currently connected to the Exchange Server.


Right Time to OST file Synchronized with the Exchange Server.


Essential Preconditions:


  1. The user must possess an IMAP Gmail account already configured in MS Outlook.

  2. An email client that supports the EML format, such as Mozilla Thunderbird, Windows Live Mail, Zoho Mail, and others.


Procedures for Converting OST File to EML Format:

Before initiating the conversion process, ensure that you have satisfied all the essential prerequisites outlined earlier. Here's a systematic guide to transform the OST file to EML format when it remains synchronized with the Exchange Server.


Transfer OST File to Gmail: Initiate the process by transferring the pertinent OST file to the previously configured Gmail mailbox. This can be effortlessly accomplished through a straightforward drag-and-drop operation.


Integrate the Account with Thunderbird: Subsequently, configure the identical Gmail account within Thunderbird, an email client compatible with the EML format. Upon successful configuration, the data from the OST file will become accessible within the Thunderbird platform.


Export as EML File from Thunderbird: Lastly, within the Thunderbird interface, users can execute a drag-and-drop action of the OST emails to a designated location on their system, resulting in automatic conversion and storage of the data in the EML format.


Considerations and Constraints of the Method:


Here are five compelling reasons to steer clear of manual approaches when converting OST to EML, PST, PDF, MSG, or any other format:


  1. Complexity and Error-Prone: This method is intricate and susceptible to various errors, particularly for users with limited technical expertise.

  2. Time-Consuming: The manual process is time-intensive, demanding a significant investment of users' valuable time and effort.

  3. Inefficiency with Multiple OST Files: Manual methods prove impractical for efficiently saving multiple OST files to EML format.

  4. Dependency on Microsoft Exchange Server: This approach is only effective when the OST file is actively connected to the Microsoft Exchange Server.


In situations where the OST file is not currently linked to the Exchange Server.

In instances where the OST file is not linked to the Exchange Server, manual procedures for saving it in the EML format become impractical. In such scenarios, the use of a specialized tool becomes indispensable. WebbyAcad for OST converter tool is precisely designed to recover, convert, and save OST files into various formats, including EML, PST, MSG, MBOX, PDF, and more. It provides the ability to convert both single and multiple OST files while ensuring the preservation of data integrity. The software is fully compatible with all versions of Microsoft Outlook and Windows operating systems.


Save OST file to EML format by Webbyacad OST Converter.


  • Begin by downloading the Webbyacad OST converter tool onto your system and then click on ‘Browse’ to incorporate the OST file into the software.

  • Once added successfully, proceed by selecting ‘Next.’

  • Opt for any mailbox item to generate a comprehensive preview of the content.

  • For the conversion of a single email, simply right-click on the desired email and choose ‘Save as EML.’

  • If dealing with multiple files, select the ‘EML file’ option and click on ‘Next’ to move forward.

  • Utilize filters if needed to locate specific emails, then proceed by clicking on ‘Next.

  • Click on ‘Browse’ to designate a saving path for the new EML file. Finally, conclude the process by clicking on ‘Finish.’

  • The OST file will undergo conversion and be saved as an EML file at the specified location. To complete the process, select ‘OK.

Final Thoughts

The OST and EML file formats manifest notable differences, introducing complexity to the transfer process. The key query that arises is, 'How can one efficiently convert essential OST emails into EML files?' The methods employed largely depend on the connectivity status of the OST file with the Exchange Server. Manual techniques, although time-consuming and intricate, are primarily suitable for converting individual email files. On the other hand, a more streamlined and simplified approach is to utilize a professional OST Converter tool, offering a straightforward solution to the conversion process.

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