Before you install any of the Communications Suite products, you need to understand which schema you will use. The schema is the set of definitions describing what types of information can be stored as entries in the directory. Two schema choices, Sun Java System LDAP Schema 1 and Sun Java System LDAP Schema 2, are available and supported with Communications Suite. Your choice of schema depends on the following criteria:
Are installing Communications Suite components for the first time
Are integrating Communications Suite with other Java Enterprise System products, such as Portal Server
Have an existing version of any of the Communications Suite components, for example, if you are upgrading from Messaging Server 5.2
See Chapter 8, Understanding Schema and Provisioning Options for more information on schema choices.