14.5.2.3 To Disable a User with Calendar Server Utilities (csuser disable)

The disable command prohibits a user from accessing calendar data, but it does not remove calendar service from the user’s LDAP entry or the Calendar Server database. The utility signals the user being disabled by adding icsAllowedServiceAccess="http" to the user LDAP entry.

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.