When I got installation CD with MS Office 2003, I have started upgrade from older version, Office XP. But Outlook doesn’t run correctly and it said something about connection error to server.
I have tried lot of tricks and solution I found in MS Knowledge Base. Problem is in missing Registry entries, which are deleted by Outlook XP uninstall process. Just add:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols ncacn_np=Rpcrt4.dll ncacn_ip_tcp=Rpcrt4.dll ncadg_ip_udp=Rpcrt4.dll ncacn_http=Rpcrt4.dll