How to Transfer Kerio Connect Emails to IMAP-Supported Web Apps & Mail Clients?
Kerio Connect is a business email and collaboration platform that stores emails, folders, attachments, contacts, calendars, and other mailbox data. As organizations change their email infrastructure, users may need to move Kerio Connect emails to another IMAP-supported web application or email client.
IMAP (Internet Message Access Protocol) makes it possible for compatible email applications to synchronize mailbox data with an email server. Kerio Connect supports IMAP access, allowing users to configure their accounts in compatible email clients and access their mailbox data.
However, accessing Kerio emails through an IMAP client and actually transferring a large mailbox are two different tasks. For a few folders, the manual approach may be sufficient. For bulk mailbox migration, attachments, multiple users, or selective data transfer, a dedicated Kerio migration solution can simplify the process.
This guide explains how to transfer Kerio Connect emails to IMAP-supported web apps and mail clients, the manual method, its limitations, and an automated approach using the Kerio migration Tool for Mac.
Overview of Kerio Connect to IMAP Migration
An IMAP-based migration generally involves connecting to the source Kerio Connect mailbox and transferring its email folders to another IMAP-compatible destination. The destination could be –
- An IMAP-supported webmail account
- A desktop email client
- Another IMAP mail server
- A cloud-based email service supporting IMAP
- A mailbox configured through Apple Mail, Thunderbird, or another compatible application
The exact procedure can vary according to the destination service, authentication requirements, mailbox size, and server configuration.
IMAP primarily handles email messages and folders. It should not be assumed that all Kerio Connect data, such as calendars, contacts, and tasks, will automatically transfer through an IMAP workflow. Microsoft’s documentation, for example, notes that IMAP migration is intended for mail-folder items rather than contacts, calendars, or tasks.
Why Transfer Kerio Connect Emails to an IMAP-Supported Application?
There are several reasons organizations or individual users may need to move Kerio emails to an IMAP-compatible platform.
Common reasons include –
- Switching to a different email service
- Moving from Kerio Connect to a cloud-based mailbox
- Accessing old Kerio emails through another email client
- Creating a separate copy of important business correspondence
- Consolidating multiple mailboxes
- Moving email data to a new IMAP server
- Maintaining access to historical messages after changing email platforms
- A successful migration should preserve important email information such as message content, attachments, sender and recipient information, dates, and folder organization wherever the selected migration method supports it.
Method 1 – Transfer Kerio Emails Manually Using an IMAP Mail Client
One of the conventional ways to move Kerio Connect emails is to configure the Kerio account in an IMAP-compatible desktop email application and then add the destination account to the same client.
This method can be useful when transferring a relatively small mailbox.
Step 1: Collect Kerio Connect Account Details
Before configuring the account, obtain the required information from your Kerio Connect administrator or service provider, including –
- Kerio email address
- Username
- Password
- IMAP server hostname
- IMAP port
- SSL/TLS security requirements
- SMTP details, if outgoing mail configuration is required
Kerio’s documentation shows that IMAP accounts can be configured with the server hostname, username, password, secure port, and SSL settings.
Step 2: Add the Kerio Account to an Email Client
Open an IMAP-compatible email client such as Apple Mail or Thunderbird on your Mac.
Choose the option to add a new email account and enter your Kerio Connect credentials. If automatic configuration does not work, select manual configuration and enter the IMAP server information supplied by your administrator.
After successful authentication, allow the client to synchronize the Kerio mailbox.
Step 3: Add the Destination IMAP Account
Now configure the destination email account in the same application.
The destination must support IMAP or another compatible mailbox synchronization method. Enter its account credentials and server information when required.
Step 4: Allow Both Accounts to Synchronize
Wait until the required Kerio folders and messages become available in the email client.
For a large mailbox, this synchronization can take considerable time. The actual duration depends on mailbox size, number of messages, attachment sizes, server performance, and network speed.
Step 5: Copy Kerio Emails to the Destination
Select the required Kerio folders or messages and copy or move them into the corresponding folders under the destination IMAP account. For example –
- Kerio Inbox → Destination Inbox
- Kerio Sent → Destination Sent
- Kerio Projects → Destination Projects
The destination application will then synchronize the copied messages with its mail server.
Step 6: Verify the Migrated Emails
After synchronization is complete, log in to the destination webmail account and verify –
- Email messages
- Attachments
- Folder structure
- Dates
- Sender and recipient information
- Sent and received folders
Do not remove the original Kerio mailbox until you have verified that the required data is available at the destination.
Limitations of the Manual IMAP Method
Although an email client provides a practical way to move Kerio messages, it becomes less convenient as the mailbox size increases.
1. Time-Consuming for Large Mailboxes – A mailbox containing thousands of messages can take significant time to download, synchronize, and upload.
2. Requires Multiple Configuration Steps – Both the source and destination accounts need to be configured correctly. Incorrect IMAP settings or authentication details can interrupt the process.
3. Not Ideal for Multiple Accounts – Moving one mailbox manually may be manageable, but processing many Kerio user accounts requires repeated configuration and monitoring.
4. Dependency on Synchronization – The process depends on the email client’s synchronization with both servers. Interruptions in the network or server connection can affect the transfer.
5. Manual Folder Selection – Users may need to process folders individually, increasing the possibility of overlooking a mailbox folder.
6. Limited Control Over Non-Email Data – IMAP is primarily an email protocol. Contacts, calendars, tasks, and other collaboration data may require separate migration procedures. Kerio’s own migration documentation also distinguishes email migration from other types of mailbox data.
7. Difficult to Manage Selective Bulk Migration – If you need to migrate emails based on a date range, sender, subject, or other criteria, a standard email client may not provide sufficient migration controls.
Method 2: Transfer Kerio Connect Emails by Kerio to IMAP Tool
For users handling large Kerio Connect mailboxes, a dedicated backup and migration utility can reduce the amount of manual work involved.
The CubexSoft Kerio Backup Tool is designed to export hosted Kerio mailbox data to multiple file formats, email clients, webmail services, and cloud applications. Its documented output options include IMAP Server along with services such as Gmail, Outlook.com, Yahoo Mail, Office 365, Exchange Server, and others.
The tool can also preserve mailbox elements such as email content, attachments, headers, and folder hierarchy during supported export operations.
General Steps to Transfer Kerio Emails to an IMAP Server
Step 1: Install and launch the Kerio to IMAP Backup Tool on your Mac.
Step 2: Now choose any option to select Kerio Data files or folder
Step 3: Let the software load the available Kerio mailbox folders. Select the required folders or emails for transfer.
Step 4: Choose IMAP Server from the available saving or migration options.
Step 5: Enter the login details of IMAP server hostname, port, username, and password. Apply filters if you only want to transfer specific emails.
Step 6: Start the migration process and monitor the progress.
The tool documented IMAP capabilities include selective filtering and batch processing, which can be useful when handling large mailboxes or multiple accounts.
Key Features of Kerio Email to IMAP Tool
A dedicated migration application can be useful when manual IMAP transfer becomes difficult.
- Bulk Mailbox Processing – Multiple mailboxes can be processed in batch rather than manually configuring and transferring every account.
- Selective Email Migration – Filters can help users select messages according to criteria such as date, sender, recipient, or subject.
- Folder Hierarchy Preservation – Maintaining the original folder structure makes it easier to organize and locate transferred messages at the destination.
- Attachment Preservation – The migration process can retain email attachments along with their corresponding messages.
- Multiple Destination Options – Depending on the selected the tool and operation, Kerio data can be exported to technical formats, desktop email clients, IMAP servers, and various cloud services.
Manual IMAP vs. the Kerio to IMAP Tool
| Feature | Manual IMAP Method | Kerio to IMAP Tool |
| Bulk email transfer | Limited | Supported |
| Multiple mailbox processing | Difficult | Supported |
| Folder selection | Manual | Selective |
| Email filtering | Limited | Advanced filters |
| Attachment handling | Depends on client | Supported |
| IMAP destination | Yes | Yes |
| Multiple destination options | Limited | Multiple options |
| Manual monitoring | High | Lower |
| Suitable for large mailboxes | Less convenient | More suitable |
| Backup/export capability | Limited | Supported |
Conclusion
Transferring Kerio Connect emails to an IMAP-supported web app or mail client can be accomplished manually by configuring the Kerio and destination accounts in an IMAP-compatible email application. This approach can work well for a small number of messages or a single mailbox.
However, manually synchronizing and copying thousands of emails can become time-consuming and difficult to manage. Large attachments, multiple folders, numerous accounts, and selective migration requirements can make the conventional approach even more challenging.
For Mac users who need a more structured solution, the Kerio to IMAP migration Tool provides an automated way to process Kerio mailbox data and transfer it to supported destinations, including IMAP Server. It also offers bulk processing, filtering, attachment handling, and folder-preservation capabilities for supported migration workflows.
