How to select preferred CAS?

Hi there,

i just installed a second mailbox-server in a DAG and a second CAS in our Organisation.

So i have now 2 Exchange 2013 CAS-Servers. Since i installed the second CAS, all Outlook-Clients want to connect to that CAS.

Is there any way to select a preferred CAS or deactivating one CAS without getting Outlook into trouble?

Thanks for your help!