After installing Messaging Server 6.3 64–bit Edition, prepare your directory server for Messaging Server configuration. To do so, run the following script on your directory server machine:/opt/SUNWcomds/sbin/comm-dssetup.pl. See: Running the Directory Preparation Tool in Sun Java Communications Suite 5 Installation Guide
Running the Directory Preparation Tool is only for new configurations, not for configurations created with the migrate-config tool which is described in Upgrading Messaging Server.