Thanks anyway, I think it might be that RPC over HTTP Proxy is not setup on the server. Or the fact that the FQDN/path is..

https://mail.mycompany.com/owa

....and not....

https://mail.mycompany.com/exchange

There seems to be no way in Outlook to set the path so "/exchange" may be hard coded somewhere.

Oh well, back to Fetchexc...