Ok, here is the story, I have installed a new server running Exchange 2010 with all roles on it. I have a read somewhere that there could be issues having a CAS server and a mailbox server on the same box when accessing Exchange2003 OWA. Therefore, I have created a new Exchange 2010 server with just the CAS role on it.
It sees the main Exchange 2010 server no issues.
I ran this powershell command on the new Exchange2010 CAS server:
<Servername of new CAS SERVER>/OWA -ExternalURL https://
<< Public DNS NAME OF NEW CAS SERVER>/OWA -Exchange2003URL http://
<Public DNS Name of Exchangbe 2003 Front-end OWA server>/exchange
I got the following errror:
The operation couldn't be performed because object '<Servername of new CAS SERVER>\https://
<Servername of new CAS SERVER>/OWA' couldn't be found
+ CategoryInfo : NotSpecified: (0:Int32) [Set-OwaVirtualDirectory],
+ FullyQualifiedErrorId : 2671AFC6,Microsoft.Exchang