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Summary: This informative content outlines the necessity of converting OST files to EML due to platform differences, offering conversion methods for both connected and disconnected files while emphasizing a professional software solution’s effectiveness.

Due to the notable disparities among email platforms, users often find themselves in search of dependable solutions for securely converting files across different formats. This situation holds true for the conversion of OST files to EML format as well. Many Outlook users aspire to transform their OST files into the universally accepted EML format, a task that can be achieved through a combination of manual procedures and professional tools. In this article, we delve into these file formats, providing comprehensive guidance on how to seamlessly convert OST emails into EML format for a smooth transition.

Know the file formats OST & EML

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.

Instant Solution

Consider using the automated tool, Kernel for OST to PST Converter, to effectively recover damaged OST files in Outlook 2013/2016 and convert OST File to EML, PST, MSG, Office 365, and Exchange.

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.

Reasons behind saving OST to EML

These are the prime reasons behind users saving their data from OST to EML format are:

  • 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.
How to convert OST files in EML format?

The method to save OST to EML format can be done in two situations:

  • When the OST file is connected with the Exchange Server.
  • When the OST file is not connected with the Exchange Server.
When the OST file is connected with the Exchange Server.
Necessary conditions:
  • The user needs to have an IMAP Gmail account that has been configured in MS Outlook.
  • An email client which supports EML format like Mozilla Thunderbird, Windows Live Mail, Zoho Mail etc.
Steps to convert OST file to EML:

Before proceeding, ensure that you have met all the requisite conditions mentioned earlier. Now, follow this procedure to save the OST file as EML when it is connected to the Exchange Server.

  1. Copy OST file to Gmail:
    To begin with, you need to simply move the required OST file to the configured Gmail mailbox. This can be achieved by a simple drag and drop action.
  2. Configure the same account in Thunderbird:
    Now, proceed to configure the same Gmail account in Thunderbird, a client that supports the EML format. Once the configuration is successfully completed, the data from the OST file will be accessible within Thunderbird.
  3. Save as EML file from Thunderbird:
    The user can then simply drag and drop the OST emails anywhere on their system, and the data will be automatically saved in the EML format at the chosen location.
Limitations of method:

These are 5 valid reasons to avoid manual methods to convert OST to PST, EML, PDF, MSG, or any other format:

  • This is a complex method and is prone to various errors by users with limited technical knowledge.
  • It is a lengthy process and will take a lot of precious time and effort of users.
  • Such manual methods are not suitable for saving multiple OST files to EML format.
  • It works only when connected with Microsoft Exchange Server.
When the OST file is not connected with the Exchange Server.

When the OST file is disconnected from the Exchange Server, manual methods for saving it in the EML format are not available. In such circumstances, a professional tool becomes essential. Kernel for OST to PST Converter software is specifically crafted to recover, convert, and save OST files into a range of formats, including EML, PST, MSG, MBOX, PDF, and more. It offers the capability to convert both single and multiple OST files while preserving data integrity. The software is fully compatible with all versions of Microsoft Outlook and Windows operating systems.

Steps to save OST file to EML format using a professional tool:
  1. Download the software on your system. Click on ‘Browse’ to add the OST file to the software.Download the software
  2. Once added, select ‘Next.’Once added, select Next
  3. Select any mailbox item to generate a comprehensive preview.Select any mailbox item to generate a comprehensive preview
  4. To convert a single email, right-click on the email and click on ‘Save as EML.’right-click on the email and click on‘Save as EML
  5. For multiple files, select ‘EML file’ and click on ‘Next’ to proceed.Click on Next
  6. You can set filters to find specific emails and click on ‘Next.’Click Next
  7. Click on ‘Browse’ to choose a saving path for the new EML file. Finally, click on ‘Finish.’click on Finish
  8. The OST file will be converted and saved into an EML file at the location which you have selected. Finally, select ‘OK.’Select OK


The OST and EML file formats exhibit significant disparities, which can make the transfer process rather intricate. The central question that emerges is, ‘How can one effectively convert crucial OST emails into EML files?’ The methods employed largely hinge on whether the OST file is connected to the Exchange Server or not. Manual techniques, albeit time-consuming and complex, are primarily suitable for converting individual email files. Conversely, a straightforward solution lies in employing a professional OST to PST Converter tool, which streamlines and simplifies the entire process.

Kernel for OST to PST