Kerio Outlook Connector Offline Edition (KOFF) can return specific 28103 or 28101 errors during the installation process. Installation wizard might fail to detect Microsoft Outlook.
KOFF is a Microsoft Outlook extension that you can use to manage your Kerio Connect email, events, contacts, and tasks.
For proper KOFF functioning, the Outlook should be initialized/opened at least once and should be listed under Supported versions.
- Uninstall the preinstalled Office (OEM version installed by the PC manufacturer).
See the article: Kerio Outlook Connector Error Code 80048002 for reference.
- Install the official Office version from the Microsoft site: Download and install or reinstall Office 2016 or Office 2013.
- Make sure that Outlook was fully opened at least once before installing KOFF. Also, ensure that the KOFF version (32/64 bits) matches the OS and Outlook's version.
The installation wizard displays the following message indicating that Kerio Outlook Connector (KOFF) is now installed correctly.
InstallShield Wizard Completed
The InstallShield Wizard has successfully installed Kerio Outlook
Connector (Offline Edition). Click Finish to exit the wizard.