Question : When I open Outlook I get a certification error, I have a godaddy SSL certificate and the problem has happened since installing that I assume it a internal error as external (OWA) is fine no errors

I assume this issue is a mis-config with how outlook looks internally for certificates and externally and I have tried some fixes however cannot get the error to go away

Answer : When I open Outlook I get a certification error, I have a godaddy SSL certificate and the problem has happened since installing that I assume it a internal error as external (OWA) is fine no errors

From KB940726:
Set-ClientAccessServer -Identity <EXCHANGESERVERNAME> -AutodiscoverServiceInternalUri https://mail.domainname.com/autodiscover/autodiscover.xml
Set-WebServicesVirtualDirectory -Identity "<EXCHANGESERVERNAME>\EWS (Default Web Site)" -InternalUrl https://mail.domainname.com/ews/exchange.asmx
Set-OABVirtualDirectory -Identity "<EXCHANGESERVERNAME>\oab (Default Web Site)" -InternalUrl https://mail.domainname.com/oab
Set-UMVirtualDirectory -Identity "<EXCHANGESERVERNAME>\unifiedmessaging (Default Web Site)" -InternalUrl https://mail.domainname.com/unifiedmessaging/service.asmx

Open IIS Manager on your Exchange Server.
Expand the local computer, and then expand Application Pools.
Right-click MSExchangeAutodiscoverAppPool, and then click Recycle.