Sun Java System Calendar Server 6.3 Administration Guide To Disable a User with Delegated Administrator Utility (commadmin user delete)

To prevent a user from accessing calendar services, remove the service from the user’s LDAP entry, as shown in the example that follows:

commadmin user delete jsmith -S cal

This removes calendar service from the user without completely removing the LDAP entry. In addition, this command changes the user's icsStatus to inactive.