Overview

When upgrading your current Kerio Connect setup older than version 9.0, for example, 8.3.4 patch 1, it requires a specific procedure to follow. The process includes the upgrade path to the milestone versions, that can be downloaded on the Kerio Software Archive website.

All changes, improvements, and prerequisites for Kerio Connect are cumulative. It's highly recommended to upgrade only to the listed milestone versions. 

Versions prior to 7.0.0 are named as Kerio MailServer product.

Prerequisites

• If you are already on version 9.0 or above, please refer to the Upgrading Kerio Connect topic.
• We recommend taking a full backup of Kerio Connect.
• Check that the Software Maintenance is valid for the upgrade. Your Software Maintenance expiration date can be found on the splash screen of your Kerio Connect Administration console. You are entitled to upgrade to the latest released version during your Software Maintenance period, even post its expiration. For more information, please refer to Licenses in Kerio Connect.
• Check that the server meets the latest system and hardware requirements.
• Kerio Connect requires restart during the upgrade. Perform the upgrade when there is no traffic on the server or when it is least impacting on the business operation.
• You may also want to look at version-specific notes and prerequisites before upgrading.
• When upgrading a version that is older than version 7.0.0, several milestone versions must be installed before you can proceed with upgrading to the latest version. 

Milestone Versions

The list below shows the milestone versions and the order in which you must install them. You need to determine and install the versions higher than the one you are currently running until the last milestone version on-the list has been installed. These versions are available in our Kerio download archive.

1. Kerio MailServer 5.1
2. Kerio MailServer 5.5
3. Kerio MailServer 5.7.10
4. Kerio MailServer 6.0.0
5. Kerio MailServer 6.0.10
6. Kerio MailServer 6.5.2
7. Kerio MailServer 6.7.3 Patch 1
8. Kerio Connect 7.4.3
9. Kerio Connect 8.5.3

These versions are required because of changes in the installation process, so it is not possible to skip them. After you install the last milestone version on the list, you can then directly upgrade to v 9.0.

Solution

1. Visit the Kerio download archive page to find and download the relevant milestone version one by one.
2. Depending on your platform, follow the instructions below and repeat for each milestone version.
   
   

   Windows	Double-click the installer. Select your language (e.g., English). Select Modify and click Next. Leave all the components checked and click Next. When the installation completes, you can click Finish.
   OS X	Double-click the *.dmg file. Double-click the installer. Read the license agreement and click Continue. Click Agree to continue the installation. Select Easy Install and then click Install. Click Quit once the installation completes.
   RHEL or CentOS	Run the following commands: sudo /sbin/service kerio-connect stop sudo rpm -Uvh package_name.rpm sudo /sbin/service kerio-connect start Note: These commands are generic, and package_name.rpm refers to the actual package file name that you download. A real example of the second command would be sudo rpm -Uvh kerio-connect-7.2.3-4971-linux.rpm.
   Debian/Ubuntu	Run the following commands: sudo /etc/init.d/kerio-connect stop sudo dpkg –i package_name.deb These Linux commands are valid for Kerio Connect 7.0 and newer. Installing the upgrade will leave your current settings intact.

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