How to Convert PST to EML: Complete Guide for Outlook Users

Luca White
Luca White
September 25, 2026 · 7 min read
How to Convert PST to EML: Complete Guide for Outlook Users

Outlook stores your e-mail, attachments, contacts, calendars, and other mailbox information in PST files. The issue arises when you want to import these emails to an application which supports EML files. You can’t just copy a PST file into an email client that supports EML and expect it to work.

This is why users are often faced with problems such as unsupported file formats, complicated manual exports, missing attachments, lengthy conversion processes or trouble in selecting only the emails they really need.

The PST to EML conversion is a convenient solution to overcome this compatibility issue. EML files are supported by many e-mail applications, such as Thunderbird, Windows Live Mail and Apple Mail.

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Why Direct PST to EML Conversion Can Be Challenging

The main issue is that PST and EML are structured differently. PST is a database of Outlook mailbox, EML normally stands for a single email message.

So, manual conversion can be an inconvenient task, especially when there are thousands of messages scattered in different folders in PST.

Common problems are:

· Issues when exporting a large number of emails

· Cannot select only required folders

· PST files lost or difficult to find

· Manual translation procedures are complex

· Missing important emails

· PST file is inaccessible or has unhealthy problems

· Want to open Outlook emails in another EML-supported application

Before you start, make sure that you can access the PST file normally. The current product documentation says the converter is intended to work with healthy, accessible PST files, not corrupted PST files.

Practical Solutions for Smooth PST to EML Migration

1. Verify and Backup Your PST File

Locate the PST file prior to the conversion and ensure that it opens successfully in Outlook or otherwise is available. If the file is damaged, repair or recover it prior to conversion.

Also, create a backup copy of the original PST. This provides you with a safe source to repeat the process if you need to.

2. Filter and Select Only Required Folders

If you only need Inbox or Sent Items, there is little point in processing the entire mailbox.

To make managing your EML collection easier by reducing unnecessary output, you can select only the folders you need.

3. Use a Dedicated Standalone Converter

If the manual export is not possible you can use a specific PST to EML app to simplify the workflow. The current GainTools product page says “Users can convert the entire PST or select individual folders and preview the data before conversion.

GainTools PST to EML Converter has options to attach PST file, preview its contents, select required data, choose EML as output format and define destination folder for this type of migration.

Step-by-Step: How to Convert Outlook PST to EML

Step 1: Download and open the program

Download and install the converter on a suitable Windows PC. Once it’s installed, launch the app.

Step 2: Import PST File

Locate your Outlook PST file with the Add File option. Browse the file you want to convert.

It has the ability to scan the selected PST and display the available folders in it.

Step 3: View PST Data

Once the scan is complete, review the mailbox structure that is displayed.

Before starting the conversion you can view folders and single items. This helps to make sure the data you require is present, and to select the right mailbox content.

Step 4: Choose Required Folder or Data

Select whether you want to convert the entire PST or only selected folders.

Say, for instance, you want to transfer old correspondence to Thunderbird. Then you might want to choose Inbox and Sent Items, instead of contacts, calendars or other data you don't need to transfer.

Step 5: Select EML as the output format

Select EML from the list of output format options.

This tool is specially designed to export Outlook PST data into EML format and supports the PST files from the Outlook versions like 2003, 2007, 2010, 2013, 2016 etc.

Step 6: Choose Destination

Select a location on your computer to save the converted EML files.

PST to EML Conversion to make a separate folder which will help in finding and organizing the resultant files.

Step 7: Begin the Conversion

Click Convert Now to start the migration. The selected PST data exported to EML files at specified destination.

Real-World Migration Example: PST to Thunderbird

Say an employee has a 12 GB Outlook PST with years and years of emails, but wants to access the correspondence in Thunderbird.

Opening and saving thousands of emails manually will take a lot of time. Or, the user can add PST into the converter, view the mailbox, select Inbox and Sent Items folders, select EML, define an output folder and start the conversion.

Then the user can test several EML files in Thunderbird before importing the entire collection. This way you don’t need to open and save every Outlook message manually.

Key Benefits of Using a PST to EML Converter

A dedicated conversion approach can be helpful because:

· Supports full or partial folder conversion

· Allows preview before export

· Allows users to choose output location

· Supports PST files of various Outlook versions

· Assists in moving Outlook data to an EML-supported application

· Less manual, repetitive email exports

· Provides filter options to select desired PST data

· Can skip empty folders during conversion

The software also comes with a trial version that can convert 10 items per PST folder and users can check out the process before they buy a full license.

System Requirements for the Conversion Tool

Current product information says that the converter supports:

Supported Operating Systems: Windows 11, 10, 8.1, 8, 7

Processor: 1 GHz or faster

RAM: Minimum 512 MB

Hard Disk: 100 MB free disk space

Resolution: 1024 x 768 display

The current system requirements say Windows is the supported platform, so if you’re a macOS or Linux user, keep that in mind.

Frequently Asked Questions

Can a single PST folder be converted to EML?

Yes. The software has an option to export specific PST folders instead of converting the entire mailbox.

Can I preview the PST data before conversion?

Yes. The application gives a preview of the scanned PST data so that users can go through the folders and individual items before exporting.

Can I convert inaccessible or corrupted PST?

The product documentation indicates the converter is for healthy, accessible PST files. Conversion cannot be done until a corrupted PST has been repaired or recovered.

Can I use converted EML files in Thunderbird?

Yes. EML is supported by Thunderbird, which is listed as one of the applications on the product page.

Do we need Microsoft Outlook while conversion?

As stated on the product page, the utility is a standalone PST to EML converter and has its own PST loading and scanning workflow. Users should still validate their specific environment and PST access before undertaking large migrations.

Do I keep my original PST file after conversion?

Yes. Check the converted EML files and confirm the required emails and attachments are present. Do not delete the original PST until you are sure of the conversion.

Conclusion

PST to EML Conversion is required when Outlook email data needs to be opened in an EML compatible application. Manual methods may work for a small number of messages but become difficult to manage when the PST has a large mailbox.

GainTools PST to EML Converter offers a structured conversion process for users who wish to process selected folders, preview mailbox data and export Outlook emails into EML. The most important things are to verify the PST before converting, select only needed data, save output to a well-organized place and check the resulted EML files before deleting the original mailbox.

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