How to Convert Kerio to PST For Outlook? Proven Methods

Written By
Shivansh Shukla

Updated on
November 6th, 2025

6 minutes Read
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Introduction: Many small businesses use Kerio Mail Server to manage their emails and communication. But when they want to move to Outlook, many challenge arises to convert Kerio to PST format. Outlook does not support Kerio data directly, which makes the transfer difficult. In this blog, we will explain why this conversion is important. Also, provide step-by-step methods, both manual and using an IMAP Backup Tool, that provide a safe transfer of your Kerio data into Outlook PST files.

I have been using Kerio Mail for years, but now I want to transfer my emails to Outlook. Is there any easy way to export Kerio FDB file to Outlook PST format?

William Martinez

Why is it Important to Migrate Kerio to PST?

Transferring your Kerio mailbox to PST is important when you move to Outlook. This process keeps your emails, contacts, and attachments safe and easy to access. Let’s see more reasons:

  • By converting, you can easily access all your Kerio emails directly in Outlook.
  • It keeps your email attachments, contacts, and calendar items intact.
  • PST file maintains the original folder structure for easy navigation.
  • You can use your emails across multiple Outlook versions.
  • Also, it protects data from accidental loss or corruption.
  • PST file saves time with a smooth and organized email management system.

Distinct Techniques to Convert Kerio to PST

Depending on your needs, there are different ways to convert Kerio mailbox data to PST. You can use a manual method for small amounts of data or an automated tool for faster and more reliable migration. Let’s explore each one in detail:

Manual Techniques to Export Kerio Connect Email to PST

You can export Kerio emails to PST using the free built-in tools. These methods work well for small mailboxes and for users who are comfortable with Outlook settings. Let’s export Kerio mailbox to PST free:

Method 1: Convert Kerio Outlook Connector FDB File to PST

This method lets you sync your Kerio mailbox with Outlook and export all emails, contacts, and calendars to a PST file. It is suitable for small to medium-sized mailboxes. Follow the steps:

  1. Firstly, install Kerio Outlook Connector on your computer.
  2. After that, start Microsoft Outlook and go to File > Account Settings > Add Account.
  3. Further, enter your Kerio account credentials to connect your mailbox.
  4. To proceed, wait for Outlook to sync your emails, contacts, and calendars from Kerio.
  5. Meanwhile, go to File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst).
  6. Later, select the folders you want to export and choose the destination location.
  7. Lastly, select Finish to start the PST export.

Method 2: Convert Kerio to PST via IMAP

If you cannot use the Kerio Outlook Connector. You can set up your Kerio account in Outlook using IMAP and then export your emails to PST. Steps can be defined as:

  1. Initially, start Outlook and go to File > Add Account.
  2. Afterward, choose Manual setup or additional server types > IMAP.
  3. To proceed, enter Kerio IMAP server details:
    • IMAP server: imap.yourdomain.com
    • Port: 993 (SSL enabled)
    • Username and password: your Kerio credentials
  4.  
  5. Meanwhile, complete the setup and let Outlook sync your Kerio mailbox.
  6. Further, go to File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst).
  7. Then, select the folders you want to export and select Next.
  8. Finally, choose the destination location and select Finish to export.

Method 3: Migrate Kerio Connect Mailbox to PST Using Drag and Drop

If you have access to Kerio Webmail or the Kerio desktop client, you can manually export emails to a PST file using drag and drop. This method is simple for small amounts of data. Follow the procedure to get it done:

  1. At first, launch Outlook and create a new PST file.
  2. Afterward, go to File > New Items > More Items > Outlook Data File.
  3. Further, start Kerio Webmail or the Kerio desktop client.
  4. To proceed, select the emails or folders you want to move.
  5. Lastly, drag and drop them directly into the PST folder in Outlook.

Limitations of the Manual Processes to Export Kerio to Outlook

  • Manual methods are time-consuming when handling large mailboxes.
  • By using these methods, some emails or attachments get missed during the export.
  • These processes are confusing for people without technical knowledge.
  • The original folder structure is lost during the transfer.
  • Syncing via IMAP or the Outlook Connector can be slow or have errors.
  • It is difficult to move multiple mailboxes at once manually.

Expert Solution To Convert Kerio to PST 

With the MacSonik IMAP Backup Tool, you can safely export your Kerio mailbox data to Outlook PST format. The tool also allows you to backup emails in different formats like PST, PDF, MBOX, and more. You can also transfer multiple mailboxes at once. This software supports direct migration to popular webmail services. Also, keeps all attachments intact, lets you filter emails before exporting, and avoids creating duplicate emails. With the help of this tool, you can also migrate BigRock email to Office 365 and other formats.

Now, follow these steps to Export Kerio mailbox to PST online

  1. Firstly, install and open the MacSonik IMAP Backup Tool on your PC.
  2. After that, select Continue and select either Single Mode or Batch Mode.
  3. To proceed, enter your Kerio account login credentials.
  4. Now, select the folders you want to transfer and select Next.
  5. Further, choose PST as the output file format from the list of options.
  6. Later, apply any filters you want, such as date range or specific emails.
  7. Finally, select Next to start the export process and save your emails to PST.

Note: This tool also allows you to migrate Hostinger email to Google Workspace.

Conclusion

Exporting Kerio mailbox data to PST is essential for accessing your emails, contacts, and calendars in Outlook. Manual methods are free, but they are time-consuming, complicated, and risk your data when dealing with large mailboxes. A professional tool makes the process fast, safe, and reliable. It preserves attachments, supports bulk export, and works with multiple formats. That’s why users choose an automated tool to convert Kerio to PST for smooth email management and easy access to data.

Q1. Which is the best tool to export Kerio Connect emails to PST?

Ans: The MacSonik IMAP Backup Tool is one of the best tools for this task. It safely exports emails, contacts, and attachments to PST, supports bulk migration, preserves folder structure, and avoids duplicates.

Q2. Is there a maximum file size while saving Kerio Connect mailboxes in Outlook PST?

Ans: Outlook PST files have size limits depending on the version. For example, Outlook 2010 and later support up to 50 GB per PST file. Using a professional tool helps in managing large mailboxes without data loss.

About The Author:

Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.

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