How to Convert OST Emails to EML Files in Bulk? [Updated 2025]

Want to convert OST to EML files? This guide will help you convert OST emails to EML files with attachments. Read till the end and convert your emails without any hassle. Let’s get started. 

One of the most frequent technical queries users face is how to export OST emails into EML file format. To do that, all you need is a reliable method that ensures accurate and efficient OST to EML conversion. This article provides a step-by-step explanation of how to export OST data into EML files safely. It also includes a detailed guide for performing manual OST to EML conversion with complete data integrity.

Now the question is – How to convert OST to EML Files? There are two ways of conversion, either manually or using an automated tool. If you are looking for a manual solution, then you must be aware that it is not recommended. You can face data loss, incomplete conversion, etc. On the other hand, an efficient OST to EML converter is the best bet. 

In this post, we will discuss both the solutions to convert OST file to EML format. Before that, let’s talk about both file formats. 

What is OST File & EML Format

An OST file is used by Microsoft Outlook to store your emails, contacts, calendar, and other data on your computer. It allows you to access your mailbox even without an internet connection, and syncing changes once you reconnect. On the other hand, an EML (Electronic Mail) file contains a single email message with details like the sender, receiver, subject, date, message body, and attachments, and can be opened in various email clients such as Outlook, Thunderbird, Apple Mail, Zoho Mail, and Windows Live Mail.

Why We Need to Export OST to EML?

Behind the conversion, there are many reasons; for more, you should read the next passage and know the reason:

• System Crash: Many viruses can affect PC and laptop machines. If a virus attacks the MS Exchange server, it could potentially become the primary cause of a system crash. In such situations, it can go out of hand and result in multiple errors in MS Outlook.
• Backup Needs: In any situation, these different methods to take OST files backup in EML format allow users can recover the data in case of system failure or accidental file deletion.
• Data Sharing: When we talk about Outlook file sharing, it is difficult to share OST files with others easily. But it is quite good while using an EML file format; the email file data transfer becomes simple and quick.
• Switching or Migration: It is also mentioned above that EML file formals can be easily synchronized with any platform or email client, whereas OST files work only with MS Outlook. Therefore, the conversion becomes essential when the transfer is to another email client.

To know the deep knowledge and procedure of change OST file into PDF read this passage and know the proper way of conversion into PDF format.

Manual Outlook OST file into EML Conversion [Approach]

1.  Approach: Just Drag and Drop Outlook OST Email File

First, the user requires OST file emails to be migrated to Gmail. To do so, well, this is pretty simple in Outlook and OST files: ‘Drag and drop the OST email data file you want to transfer into the configured Gmail account. This should allow OST files to be copied into Gmail mailbox.

2. Approach: Add Gmail File Data into Thunderbird Email Client

After completing the above approach, the user must sync the same Gmail account file data to Thunderbird. Then, after completing the conversion process, you can access the Gmail data in Thunderbird.

3. Approach: Last Extract EML File Data from Thunderbird

In the next procedure, we want to extract EML files from Thunderbird, then follow the steps:

1. Run the program “Thunderbird” client on PC or Laptop.
2. Select the desired emails and labels that you want to transfer from Gmail to Thunderbird email client. One can also use the keyboard shortcut key “Ctrl+A” for entire email selections with one press.
3. Choose desired emails and select the folders or entire directory and email labels, and proceed to the next option and hit the Saving option on the next screen.
4. Now navigate the location from your data storage media to save the selected email files. 

Professional Method Import/Export OST File into EML Format

OST file batch conversion or bulk conversion of OST email data files to EML is a lengthy and time-consuming process. Making this process smooth and quick using the BLR OST to EML Converter that helps users export OST to EML in just a few clicks. By using the software for OST conversions into various formats, it’s amazing; also, the software helps users read not accessible OST files in just a few moments.

Let’s begin the procedure….

1. In the first step, users need to download software to export OST to EML. Next, go to the main software interface, then click on Add file and select the OST file. 

2.  Second step user need to select files it’s automatic to create a hierarchy in table format. Then select on particular label or folder. Wait until all emails files or data are not shown in preview mode. After seeing the file in preview mode, just select the files that you want to export in EML format. Next, press the next button.

3. Last step user needs to select the format for conversion. In other words, to export OST to EML just select the EML option and create a filter according to what users need. At last, just click on the export button to get the whole OST email data into EML format.

Note: The User needs to activatethe software for batch or bulk conversion at the same time. 

Conclusion

The reader should be able to get all the needed information from this article. In this write-up, we have come to know about the dissimilarities between OST and EML files and why there is a need for OST to EML conversion. For this, we introduced two different methods of exporting Outlook OST files depending on the specific situation. In this case, if OST file is linked with the MS Outlook email account, then it is easier to switch OST emails to EML format. However, if you want to export an orphaned OST file, then you will require the help of professional software.

FAQ’s

Q1. What is an OST file in Outlook?

Ans. OST is the offline database file that is automatically converted when you connect Outlook with any IMAP account. It will be helpful to access your emails when you don’t have network connectivity. 

Q2. Does converting OST to EML affect attachments or formatting?

Ans. No, with the BLR OST to EML Converter tool, you can convert your emails without affecting your emails and attachments.