When you install a new Directory Server, you must move the following Messaging Server data:
Personal address book (PAB) data
Messaging Server configuration data
Messaging Server Domain Component (DC) tree. This applies only if you use a Schema 1 directory structure.
Personal Information Store Database (PiServerDB)
Communications Express stores personal address-book data in LDAP entries under the distinguished name (DN) o=PiServerDB.
Migrating user/group, PAB, and DC tree data to a new Directory Server is a relatively simple task: you take user and PAB LDIF data from the original Directory Server and load it into the target Directory Server.
Migrating Messaging Server configuration data is much more problematic. This is the subject of this technical note.