The following article fixes the Outlook security certificate error your users get when they connect to your exchange server internally. This is typically from installing a 3rd party SSL Certificate.
Issue: Outlook anywhere works fine with third party cert, but internal Outlook clients get cert error with NETBIOS name of Exchange server.
Note: I tested this on Exchange 2010 as well.
Change the URLs for the appropriate Exchange 2007 components. To do this, follow these steps:
`Set-ClientAccessServer -Identity CAS_Server_Name -AutodiscoverServiceInternalUri https://mail.contoso.com/autodiscover/autodiscover.xml`
`Set-WebServicesVirtualDirectory -Identity "CAS_Server_NameEWS (Default Web Site)" -InternalUrl https://mail.contoso.com/ews/exchange.asmx`
`Set-OABVirtualDirectory -Identity "CAS_Server_nameoab (Default Web Site)" -InternalUrl https://mail.contoso.com/oab`
`Set-UMVirtualDirectory -Identity "CAS_Server_Nameunifiedmessaging (Default Web Site)" -InternalUrl https://mail.contoso.com/unifiedmessaging/service.asmx` _Note: The command in step 5 is required only in an Exchange 2007 environment._ This command no longer exists in an Exchange 2010 environment. Instead, the WebServices URL is used for this purpose.
Now that you have finished, you will not see anymore certificate popups. I highly recommend issuing a proper certificate if possible, but this typically happens when your active directory is not resolvable from the outside world. Such as
contsco.local instead of