How to Convert PST to Maildir Format?
Jackson Strong | May 14th, 2026 | Data Conversion
In this guide, we will explore the best methods to convert PST to Maildir, including manual and automated solutions. If you have the same query, do check out this blog now.
Microsoft Outlook stores emails in PST (Personal Storage Table) format, which is widely used for managing emails, contacts, and calendars. However, many email servers and Linux-based mail systems use the Maildir format, which stores emails as individual files in directories. Since Outlook does not support Maildir, users need a way to export PST emails to Maildir for compatibility with mail servers like Postfix, Dovecot, and Qmail.
Overview of PST and Maildir
Before you begin the conversion process, it is important to understand how both file formats store and manage data. Having a clear understanding helps you identify why the conversion is necessary and how the mailbox structure changes after exporting.
PST File Format
PST file format stands for Personal Storage Table, created by Microsoft Outlook to save mailbox data locally on the system. It stores complete mailbox data, including emails, contacts, calendars, notes, journals, attachments, and more. It is commonly used for backup, archiving, and migration purposes. There are mainly two types of PST files:
- ANSI: Outlook 2002 and earlier versions create ANSI PST files. This file has 2GB size limitation and does not support multiple character sets.
- Unicode: Outlook 2003 and later versions create Unicode PST files. It has a limit of 20GB for Outlook 2003 and 2007, and also increased for later editions. It supports multiple character sets.
Maildir File Format
Maildir format is a common way of storing email messages on a file system, rather than in a database. Each message is assigned a file with a unique name, and each folder of Maildir is called a directory. It stores all its mailbox data in different subdirectories.
A Maildir directory usually has three subdirectories named tmp, new, and cur.
- The tmp subdirectory temporarily stores email messages that are in the process of being delivered. It may also store other kinds of temporary files.
- The new subdirectories store messages that have been delivered but have not yet been seen by any mail application.
- The cur subdirectory stores messages that mail applications have already seen.
Why Users Convert PST to Maildir Format?
There are several advantages of exporting Outlook PST emails. Some of them are:
- Maildir stores each email message as an individual file, which makes it easy to manage, backup, and restore each email as compared to PST.
- In PST, the corruption risk is higher if one file gets corrupted, multiple emails can be lost. Whereas, in Maildir only a single file will get affected.
- PST file is only supported by MS Outlook. While Maildir is a modern format, compatible with Linux systems and their mail servers, such as Thunderbird, Dovecot, Postfix, etc.
- When an organization moves from Windows Outlook to Linux Mail server. Exporting Outlook PST file to Maildir allows for migrating their data.
How to Export Emails from PST to Maildir for Free?
Since Outlook does not support Maildir, you can use Thunderbird as an intermediary by configuring an IMAP account and exporting emails.
Note: If you have orphane PST file then first, import it into Outlook and then follow the below given steps to complete the conversion process:
Step 1. Configure an Email Account in Outlook
- Open Outlook on your system.
- Go to file menu and click on Add Account.
- Enter your email account email address and click Connect.
- Choose IMAP as Account type.
- Now, enter IMAP details and complete the configuration.
- Once configured successfulyy, a new mailbox folder will appear in Outlook.
Step 2. Move PST Emails to the Configured Email Account
- Open the PST data in Outlook.
- Select emails or folders.
- Drag and drop them into the configured email account folders.
- Outlook will begin synchronizing emails with the mail server.
- Wait until the synchronization process is completed.
Step 3. Configure the Same Email Account in the Maildir-supported Email Client
- Now, open a Maildir-supported email client such as Thunderbird.
- Click on Tools and select Account Settings.
- Click on Account Action and select Add a Mail Account.
- Configure the same IMAP email account in Thunderbird.
- Thunderbird will automatically synchronize all emails from the server.
- Now, imported PST emails will become accessible in Thunderbird.
Step 4. Enable Maildir Storage Format
- Open Account Settings.
- Go to Server Settings.
- Enable Maildir Storage Format.
Thunderbird will now store synchronized emails in a maildir structure. Once synchronization is complete, all imported PST emails will be available in Maildir format.
How to Convert Outlook PST Emails to Maildir File Format Automatically?
The manual method is lengthy and takes a lot of time to complete the conversion process. To make the process easier and faster, users can use a professional tool. One such tool is the Advik PST Converter. This tool quickly exports PST emails to Maildir without manual effort. It keeps email formatting, attachments, and folder structure intact. You can convert multiple PST files at once with fast and secure processing. The simple interface makes it easy for anyone to use. It works with all Outlook versions, including 2019, 2016, and 2013. Just add your PST file, choose Maildir, and start the conversion in a few clicks.
Now, click on the below free download button to try it for free.
Steps Export PST to Maildir Without Outlook
Step 1. Run the PST to Maildir Converter on your system and click Next.

Step 2. Add PST file to the software panel and press Next.

Step 3. Choose the required folders and subfolders and hit on Next.

Step 4. Now, select Maildir as a saving option from the given list.

Step 5. Apply Filter Options for selective conversion. (Optional)

Step 6. Choose the destination location and click Next to begin the process.

After completing the conversion process, you can import the Maildir file into any email client that supports Maildir Format.
Benefits of Using the Professional Tool
- Bulk Conversion: The tool is capable of handling multiple Outlook data files, meaning the user can convert multiple PST files using the select folder option. Additionally is there is no size restriction to the PST files that need to be imported.
- Advance Filter option: The tool has an advanced filter, which helps users segregate a specific type of data or individual files. This helps users target only the required data.
- Faster Solution: The tool’s automated approach and capabilities help the user save time and effort and provide accurate results.
- Easy-to-understand GUI: The tool’s User interface is easy to understand and doesn’t require going through a guide. Additionally, this reduces human errors.
- Export Emails with Attachment: The data converted will have all the attachments, like photos and documents, attached to the conversion. Additionally, the metadata, like CC, sender’s name, etc., is also maintained.
- Export Corrupted PST Files: The software is able to convert orphaned and corrupted PST files data without any hassle.
Final Words
In this blog, we have discussed the two best ways to convert PST to Maildir Format. However, we came to know that the manual way is a lengthy and complicated process. That’s why experts always use an automated solution like the one mentioned above. With this tool, users can easily transfer emails from Outlook to Maildir-supported email clients. Hence, it is the best alternative to export PST emails to Maildir due to its ease of use and data authenticity features. If you are still having trouble exporting emails from Outlook PST to Maildir format, please feel free to chat or contact us at support@adviksoft.com.
FAQs
Q1. Can I convert multiple PST files to Maildir at once?
Ans. Yes, this tool supports batch conversion, allowing you to export multiple PST files to Maildir in one go.
Q2. Will the tool keep my email folders and attachments?
Ans. Yes, it preserves the folder structure, attachments, and email formatting during the conversion process.
Q3. Do I need Outlook installed to convert PST to Maildir?
Ans. No, the tool works without Outlook and can directly convert PST files to Maildir format.
Q4. Is it possible to convert Outlook 2016 PST files to Maildir format?
Ans. Yes, you can export PST files from Outlook 2016 to Maildir format.


