Set the LDAP_SCHEMALEVEL option value to 2.
You can set the following values for the LDAP_SCHEMALEVEL option in the option.dat file:
LDAP_SCHEMALEVEL=1 enables Messaging Server to support Schema 1.
LDAP_SCHEMALEVEL=2 enables Messaging Server to support Schema 2, native mode.
For details about editing and using the option.dat file, see Editing the Option File