I have an Exchange 2007 server that's been running for several years. It has a purchased SSL certificate. I recently installed an Exchange 2013 Server and moved one mailbox to it. It was working fine for that one mailbox for both OWA and Outlook 2010.
I tried exporting the SSL certificate from the 2007 and import into the 2013. That process failed as it shows no name with an Invalid status. This probably failed because I don't recall setting FQDN name on the 2013 server when installing so it probably doesn't match the certificate so I deleted it.
Now when I open Outlook 2010, I get error: "There is a problem with the proxy server's security certificate. The security certificate is not from a trusted certifying authority. Outlook is unable to connect to the proxy server InternalServerNameHere (error code 8)."
If I look at my Outlook Account settings, for servname it has a very long line of letters and numbers with @MyInternetDomainName. It doesn't have the actual internal server name as it did when mailbox was on my 2007 server.
Is there some way of fixing this without restoring from a backup? I can access that mailbox from OWA but not Outlook. Also, it will not let me move that mailbox back to my 2007 Server. Thanks!