Migrate Kerio to Office 365 Account With Easy & Fast Guide

At first, IT admins might find it difficult to migrate Kerio to Office 365. It is not a standard email movement as Kerio and Office 365 are two completely different email platforms. That being said, with the right strategy, this tough process can also become super simple.

The main problem that businesses usually struggle with is that Kerio stores all email contacts, calendars, and tasks separately in a proprietary file format. None of which can be read by M365 natively.

Despite this problem, I present three distinct ways in which you can move all email messages from your Kerio account to the Office 365 cloud. That too without risking any data loss.

These are:

An Automated Tool
Exchange Admin Center Batch Import
Kerio to Outlook Connector Export Mechanism

Picking Microsoft 365 is indeed the right choice as it offers many different advantages over Kerio. Be it in terms of business productivity applications or AI integration, Kerio is nowhere near M365.

Before we proceed, I would like you to collect the following information and keep it with you. It would be incredibly helpful when we attempt to move data from Kerio to Office 365.

Kerio Connect server hostname — mail.yourdomain.com (or the IP/hostname of your on-premise Kerio server)
IMAP port: 993 (IMAPS / SSL) or 143 (IMAP with STARTTLS)
SMTP port: 587 (STARTTLS) or 465 (SSL)
Your Kerio Connect email credentials (admin account recommended for bulk migration)
Microsoft 365 admin credentials and Azure Application ID

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Let us begin with a brief overview of the two systems. It will help to establish exactly why countless organizations prefer M365 over Kerio.

Overview of Kerio Mail And Microsoft 365

With this quick overview of both platforms, you will understand why most users prefer to migrate Kerio to Office 365 / Microsoft 365 for email management.

Kerio Connect – Practically speaking, it is an enterprise-class email client where one can organize email, contacts, calendars, and tasks with ease. Because it provides users with enterprise-level features, it comes with a low cost of ownership. Therefore, Kerio Mail is a great solution for small and medium-sized organizations. In addition, it also offers partner-hosted deployment, Kerio Cloud, and Kerio Cloud Private deployment options. A user can export Kerio Mail emails to the EML file format.

Microsoft 365 – On the other hand, Office 365 is a cloud-based service designed to meet the needs of businesses and individual users. It provides its users with functions such as high-end data security, user productivity, collaboration features, and other requirements. Furthermore, it also includes a user-friendly interface that can be easily accessed by all users. Keeping users’ safety in mind, Office 365 provides security features such as anti-malware and anti-spam filtering.

How to Migrate Kerio to an Office 365 Account Securely?

Since there is no manual process for this migration, we recommend that you go for an expert testing solution. For the same, IMAP to Office 365 Migration Software is best to migrate Kerio Connect to Office 365.

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It is best to choose this tool because of the secure migration process, as this tool easily transfers all emails without affecting the data. Along with this, the tool is capable of working on different versions of Windows OS, including Windows 2016 till the latest 2025 Server, and Windows 10/11 (64-bit).

Watch the tool in action:

Important note: Use the Best IMAP to IMAP Migration Tool for the destination O365 account for bulk or specific Kerio email migration. All Mac users can easily operate and perform email migration on the latest and prior versions of Mac OS.

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Highlighted Features of the Tool for Easy Kerio to Office 365 Migration

There are multiple advantages that the Kerio to Office 365 migration tool offers its users, such as

Here, you get the facility of bulk and specific email migration in just a few clicks without any data change. This tool provides date filter options for specific Kerio migrations to Office 365 / Microsoft 365. Whereas you can just set the date range and follow the process.
In addition, the tool provides full protection of user account data, including Kerio Mail accounts and Microsoft 365 accounts.
This software also has a delta migration feature, which helps in eliminating any possibility of email duplicates. This migrates only the new Kerio email from the selected mailboxes to Microsoft 365.
Windows OS Compatibility- It is smart software specially designed to work with different machines to migrate Kerio to Office 365. Hence, the user can work with this tool on Windows 2012/2016 Server, Windows 10/11 (64-bit) OS.
Apart from these, you can download the free demo version to know the rest of the details about all the tools. It provides a free trial to all Windows OS users to know and operate this advanced tool on the system.

Step-by-Step Working Guide to Perform Kerio Connect to Office 365 Migration

Download the tool on the supported Windows machine version and follow the step-by-step guide given below –

Step 1. After installing the tool on a supported machine, just go through all the Source and destination accounts in the Setup section. For this migration, select the IMAP option as a source and the Office 365 option as the destination from the software pane.

Step 2. Now, next, you will need to check the Email checkbox to have all Kerio Mail emails with attachment files. As per the requirement, check the Date Filter button to migrate Kerio to Office 365 selectively.

Step 3. The next step is to select the Other option as an IMAP server and provide Kerio Mail user account details for account validation.

Step 4. Thereafter, choose the Office 365 option as the IMAP destination account and enter the User email ID and password to validate all the permissions here, and click Next.

Step 5. At last, just fetch the required Users by either importing Users or downloading template options as available on the screen, and proceed further by clicking on Next.

Step 6. Lastly, tap on the Start Migration button to successfully start the Kerio Connect migration to the Office 365 / Microsoft 365 account in bulk mode.

Read More: Learn to migrate MDaemon to an Office 365 account in a simple way.

Use Exchange Admin Center to Migrate Kerio Connect to O365

If you already have your O365 ready, you might also have access to the admin control pane. From there, you can pull Kerio email data into the O365 cloud. Make sure the following prerequisites are complete:

Every user has the appropriate M365 subscription.
You possess the Global Admin or at least the Exchange Admin access.
The custom domain is verified in the M365 admin center.
Kerio IMAP is enabled and accessible.
You have the CSV chart of users.

Once done, follow these steps:

Step 1. Log in to M365 Admin Center. Go to Settings > Domains and verify the root domain. Add TXT verification details.

Step 2. Navigate to Users > Active users and see to it that all users have their licenses.

Step 3. Create a CSV file with three columns: Email Address, UserName, and Password. Fill it with all details.

Step 4. In Exchange Admin Center, go to Recipients → Migration. Click … → Migration endpoints → + New. Select IMAP as the migration type. Enter Kerio Details, type a unique name, and press save.

Step 5. Go back to the migration pane and click + New migration batch. Choose the correct option, add your CSV, and pick the Kerio endpoint. Click on New to launch.

Step 6. The project will run in the background and take as much time as there is data in the source. Once status shows “Synced,” send test emails and verify Office 365 delivery.

Kerio Outlook Connector Export (Email + Contacts + Calendar + Tasks)

Part A: Sync Kerio to Outlook

Install Connector: Download and install Kerio Outlook Connector.
Add Account: In Outlook, go to File > Add Account > Manual Setup > Other > Kerio Connect. Enter server/login details and sync fully.
Verify: Check that all Kerio data appears in Outlook.

Part B: Export Data and add it to O365

Export Data: Go to File > Open & Export > Import/Export > Export to a File > Outlook Data File (.pst).
Save PST: Select the root Kerio mailbox, tick “Include subfolders,” and save.
Add O365: Add your Office 365 account to Outlook (File > Add Account).
Import PST: Go to File > Open & Export > Import/Export > Import from another program or file > Outlook Data File (.pst). Select your O365 mailbox as the destination.
Verify Web: Log in to OWA to confirm the migration.

Conclusion

According to professionals, for maintaining secure data or large email data, it is best to choose Microsoft 365. Hence, in this article, we have shared how to migrate Kerio to an Office 365 / Microsoft 365 account safely. For this migration, we have also introduced a smart and expert-tested Kerio Connect migration to Office 365 solution for Windows users. This will help in a secure migration process without data loss or any modification to the existing data for all users.

Read More: Simple Way to Migrate Emails from cPanel to Outlook Account.

User Questions

Q- How to easily perform the Kerio to Office 365 migration on Windows 11?

Answer- Follow the steps for Kerio migration to Office 365 /Microsoft 365-

Step 1. Download the tool on a Windows PC.
Step 2. Select IMAP & Office 365 Platforms.
Step 3. Use Kerio Mail details & Validate.
Step 4. Enter Office 365 details, & Validate.
Step 5. Pick Users & Click Start Migration.

Q- How do I export users from Kerio?

Answer– Steps to export users from a domain

First, go to Administration Interface > Accounts > Users.
Choose any domain to export as required.
Mouse-click on the Import and Export > Export to CSV file option.
Save the file on the desktop in the above format.

Q- Can I use this software to migrate Kerio Mail emails with attachments to O365?

Answer– Yes, using this software, one can easily migrate multiple or specific Kerio emails and attachments to O365.