How to Migrate Kerio Connect to Office 365 in Batch?

  

Rollins Duke   
Published: May 9th, 2026 • 7 Min Read

Migrating from Kerio Connect to Office 365 is not as simple as users might expect. Most IT Teams often run manual methods or standard IMAP-based methods without knowing the risks or outcomes. It becomes a serious issue when it’s directly connected to your organization. So, to overcome these challenges, we provide reliable methods to easily migrate Kerio Connect to Microsoft 365.

Recurring calendar events frequently get corrupted during transfer, leading to broken schedules and frustrated users. Standard IMAP migration has many challenges such as attachment limitations, skipping files or failing during migration without showing any clear warning. On top of that, downtime is a major concern and the process may need to be repeated, which can create duplicates and also affect mailbox hierarchy and data. To overcome these challenges or when dealing with enterprise-level migration always opt for Kerio Connect to Office 365 Migration as it is specially reliable for migration and offers complete guarantee to data preservation and keeping source files unaffected and migrating a copy to the server.

Kerio Connect vs Office 365 365

Reasons to Transfer Kerio Connect to Microsoft 365

• Organizations are increasingly migrating from Kerio to Office 365 as it is reliable for security, storage, management and offers timely auto-updates to get more features, faster performance and security updates.
• Microsoft 365 offers a complete suite including Outlook, Teams, OneDrive and SharePoint with integrated tools and services.
• Microsoft 365 is specially designed for cloud environments, allowing businesses to scale users and services instantly without requiring management of on-premises infrastructure.
• With enterprise-grade security features such as multi-factor authentication, threat protection and compliance management as its special requirements which are often required for business or organization accounts.
• Centralized Admin controls, automated policies, and user management make it easier for IT Teams to manage large organizations efficiently.
  Microsoft 365 is constantly updated with new features, security, and performance improvement without manual upgrades or facing downtime.

How to Migrate Kerio Mail to Microsoft 365 Manually?

To perform Kerio Connect to Microsoft 365 Migration manually you need to use Microsoft native features such as IMAP migration and Outlook-based PST export. These approaches are useful for small businesses or need to migrate small data, but they need to be careful during execution to avoid data loss or inconsistency.

Method 1. IMAP Migration

IMAP migration is the basic approach offered by Microsoft to migrate emails from Kerio Connect. This approach is not reliable for transferring contacts, calendars or tasks.

1. Log in to Kerio Connect Admin Console.
2. Navigate to Accounts and select the user mailbox.
3. Go to configuration and select Services and choose IMAP services.
4. Login Microsoft 365 Admin Center and navigate to setup.
5. Select Data Migration and choose IMAP migration option.
6. Create a migration endpoint.
7. Upload a CSV file containing user mailbox data.
8. Map Kerio mailboxes to Microsoft 365 Accounts.
9. Start the migration batch and track migration progress from the Exchange Admin Center.
10. Verify email folders after completion.

Challenges of IMAP Migration

• This approach is only reliable for migrating emails.
• It only applies to small migrations.
• No guarantee of data preservation.

Method 2. Outlook-Based PST Migration

To use this approach, you must have installed Outlook as it works as an intermediate platform to export Kerio data in PST format, which can be easily imported in Microsoft 365.

1. Install Kerio Outlook Connector.
2. Add Kerio account in Microsoft Outlook.
3. Allow full mailbox synchronization.
4. Open Outlook and click on the File.
   
5. Select open and export and choose Import/Export.
   
6. Choose Export to a file and select Outlook data file.
   
7. Select the mailbox folder and choose export.
   
8. Sign in into Microsoft 365 Admin Center.
9. Use Network Upload(Azure AzCopy Tool)
10. Upload PST files to Azure Storage.
11. Create mapping CSV file and start PST import job.

Drawbacks of Outlook-Based PST Migration Method

• It requires Outlook, Azure and CSV mapping.
• It will take a lot of time and require much effort.
• Risk of file corruption or data loss during the process.
• Not ideal for large PST migration.

Special Benefits to opt Kerio Connect to Microsoft 365 Migration Tool

• The tool is designed to migrate Kerio mailbox data without affecting its source file. It preserves data including emails, attachments, folders and metadata during the migration.
• This software can easily handle large-size Kerio mailboxes without performance issues, making it suitable for enterprise level migrations.
• It supports direct migration to Microsoft 365 by eliminating the intermediate steps like PST files, Outlook configuration or Azure Uploads.
• This tool is especially reliable for both technical and non-technical users.
• Users can apply filter options to migrate only selective data as per date range or specific requirement reducing unnecessary data transfer.

Conclusion

Now, we hope you got the exact solution to migrate Kerio Connect to Office 365 as you expect from this guide. We have explained the top 3 techniques that can make hassle-free migration both have their own benefits and apply for specific requirements. So, you can select based on your requirement and if you have any queries regarding this then you contact our Support Team to customize our tool according to specific requirement or solve queries regarding this.