Mark the user as deleted by running the commadmin user delete command. (See the Chapter 5, Command Line Utilities, in Sun Java System Delegated Administrator 6.4 Administration Guide.
Remove services from the user.
A service can be a mailbox or a calendar. For the current version of Messaging Server, the program is called msuserpurge. (See msuserpurge in Sun Java System Messaging Server 6.3 Administration Reference). For calendar services, the program is csclean. (See the Sun Java System Calendar Server 6.3 Administration Guide.)