I'm in the process of creating a redundant Exchange environment. I currently have a single Exchange 2010 server with MBX, CAS, and HUB roles, which handles everything in my single site production environment.
My question is about implementing a CAS Array. I have four new servers configured, 2 CAS and 2 MBX. I'd like to convert the CAS servers to an array, but read that it will add all CAS servers at my site into the array. I'm pretty sure, this would have serious repercussions for our clients connecting to the single CAS server. How should I proceed at this point? I'd like to create my array, migrate existing databases from the single server into a DAG with the two other MBX servers, then remove the CAS role entirely from the single server.