Overview

CalDAV is an Internet standard that allows applications such as Apple iCal or Apple Calendar to manage calendar information on a remote server. The Kerio Connect can sync the personal, public, and shared Calendars.

Kerio Connect supports the specific CalDAV features such as Calendar availability (free/busy information), Events with privacy tag, Travel time for events, Scheduling (invitation requests), Per-folder sharing (without delegation), Older sharing notifications, Full delegation support and Custom labels for shared calendars.

Process

There are two ways to configure a CalDAV account:

Automatic configuration
Manual configuration

Automatic Configuration

Use Kerio Connect Account Assistant to automatically configure Apple iCal/Calendar accounts on Mac OS X 10.6 to Catalina. Automatic Configuration is no longer supported since macOS BigSur.

Manual Configuration

Open System Preferences -> Internet Accounts.
Click Add Other Account -> select CalDAV account.
Select Advanced as Account Type.

NOTE: you can also select Automatic or Manual, however, we recommend using the Advanced option. The default DAV paths can be found in Accessing Calendars, Contacts, Tasks and Resources Using CalDAV and CardDAV URLs in Kerio Connect. We also recommend the Advanced method in case the other 2 are experiencing sync issues.
Type your credentials and the location of your Kerio Connect server. (the below screenshot assumes a mail.example.com Kerio Connect server, with an example.com domain, which can be accessed via port 443)
Click Sign In.
(Optional) Select the Reminders application to use related Apple application.
To synchronize Public and Shared Calendars, make sure to enable appropriate Calendars synchronization in Folders to Sync -> CalDAV/CardDAV.

For more information, please refer to Synchronizing Kerio Connect Folders.