Hello Everyone, I am attempting to add an additional Exchange server to an existing site. Both servers are NT 4.0 (SP6a) and the existing Exchange server Standard Edition is 5.5 (SP4). I go through the process of joining the site, entering the correct service account password, it performs an installation of some Exchange files, does the replication and then gives me the following error message: An Internal error has occurred during directory replication. Stop and then restart the directory service. Then try directory replication again. Microsoft Exchange Server setupID no: c1030b0d Any help would be greatly appreciated. Thanks. Jerry Moore