I have a Microsoft Exchange 2010 organization within one Microsoft Windows domain and I have users accessing it through OWA.
For simplicity lets say I currently have one CAS server (CAS 1) which is accessible only through a VPN connection. Lets call the users connecting to the first CAS group a.
For some users though, I need to install another CAS server (CAS 2) so that they can connect without using a VPN connection. Lets call those users group b.
What I need to achieve is that group a can only log in to CAS 1 and group b can only log in to CAS 2.
Now I know that one can disable/enable OWA per user but in my case that is not enough because OWA must be enabled for both groups.