I have a customer running IMS with a Win2kPro IMS Server and workstations. In Outlook (Win2KPro IMS Client), when trying to connect, it will search, then bring up a window prompting for username, password, and domain. We enter the information as domain-level log-ins, but on luck. It errors out with RPC Server Unavailable. We have checked DCOM settings on server and client. Any ideas? Are we overlooking the obvious?