When I got the installation CD for MS Office 2003, I started the upgrade from the older version, Office XP. But Outlook couldn’t connect to the Exchange server, and it displayed a message about a connection error.
I tried a lot of tricks and solutions I found in the Microsoft Knowledge Base. The problem was caused by missing Registry entries, which were deleted during the 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
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