When to Deploy Schema 2
From MsgServerDocWiki
When do I need to deploy Schema 2? Do I only need Schema 2 in an Access Manager/Delegated Administrator situation?
Delegated Administrator currently supports only Schema 2. Other situations requiring Schema 2 include integration with Portal Server, and with Access Manager (for SSO).
For more information, see: Comparison of Sun Java System LDAP Schema Modes for Communications Suite Products. This article compares the Sun Java System LDAP schema modes used by the Sun Java Communications Suite products. It includes an overview and history of both modes, an example of domain and user LDAP entries for both schema modes, and a discussion on how to decide which mode is appropriate for you.

