I have an MS SBS 2008 Server, using the default config. It registered a local domain controller. mydomain.local. I'm hosting my mail with my ISP and using the SBS 2008 Pop C onnector to retrieve my mail. This is working 100%. But I have a problem with Outlook 2007 and 2010 Clients that when opening my mail client. I get an error about the autodiscovery of the certificate mismatch. Subsequently my Out of Office does not work with my Exchange. If I try set the Out Of Office via Outlook, I get that the Exchange server is unavailable. I can set the Out Of Office only via the users access to OWA. How can I fix this problem?