What is cpanel-ccs?
The cpanel-ccs service is the Calendar and Contacts Server plugin. It can be installed or uninstalled via WHM's Home >> cPanel >> Manage Plugins menu.
The Calendar and Contacts Server (CCS) plugin allows your cPanel users to manage their CalDAV (calendar) and CardDAV (contacts) accounts from your cPanel & WHM server.
More information on the plugin is available in our documentation.