Fix Outlook 2007 Certificate Errors

For SBS 2008 run the following commands in Exchange Management Shell:

Set-ClientAccessServer -Identity yourserver -AutodiscoverServiceInternalUri https://external.yourdomain.com/autodiscover/autodiscover.xml
Set-WebServicesVirtualDirectory -Identity “yourserver\EWS (SBS Web Applications)” -InternalUrl https://external.yourdomain.com/ews/exchange.asmx
Set-OABVirtualDirectory -Identity “yourserver\oab (SBS Web Applications)” -InternalUrl https://external.yourdomain.com/oab
Set-UMVirtualDirectory -Identity “yourserver\unifiedmessaging (SBS Web Applications)” -InternalUrl https://external.yourdomain.com/unifiedmessaging/service.asmx

For Exchange 2007 Standard or Enterprise on Windows Server 2008 run the following commands in Exchange Management Shell:
Set-ClientAccessServer -Identity yourserver -AutodiscoverServiceInternalUri https://external.yourdomain.com/autodiscover/autodiscover.xml
Set-WebServicesVirtualDirectory -Identity “yourserver\EWS (Default Web Site)” -InternalUrl https://external.yourdomain.com/ews/exchange.asmx
Set-OABVirtualDirectory -Identity “yourserver\oab (Default Web Site)” -InternalUrl https://external.yourdomain.com/oab
Set-UMVirtualDirectory -Identity “yourserver\unifiedmessaging (Default Web Site)” -InternalUrl https://external.yourdomain.com/unifiedmessaging/service.asmx
If you’re not sure which set of commands to use, type Get-WebServicesVirtualDirectory in Exchange Management Shell and see what is listed for name. You will either see EWS (SBS Web Applications) or EWS (Default Web Site). Match that up with the command set above and it should find the appropriate virtual directories.
On Windows Server 2008, if you see access denied errors then make sure you use Run As Administrator to run Exchange Management Shell.

Posted in: Exchange,Outlook