The disable command prohibits a user from accessing calendar data, but it does not remove the user’s information from the LDAP entry or the Calendar Server database. This command changes the icsStatus attribute from active to inactive. In non-hosted domain mode, there is no such thing as a calendar service.
For example, to disable jsmith from accessing Calendar Server:
csuser disable jsmith
If jsmith is currently logged into Calendar Server, jsmith retains access to calendar data until he logs off.