In Outlook, when opening a mail and clicking on "Open Delivery Report", it opens a new tab that says "can't reach this page". This is because the URL it tries to access points to an old server. The server it points to is an old domain controller (not even an old Exchange Server!).
Going through the registry, I found that there is an entry UseRWHlinkNavigation which contains the wrong address. However changing/deleting the key manually does not solve the problem, because it gets recreated with the wrong URL every time. How do I fix this problem so I can open and view the message delivery reports?