I have just inherited an EPO 4.0 server with clients in various states. Basically, the clients may or may not have antivirus installed, may or may not be domain members, may only have the framework service installed, or may have old versions installed. I'm going to focus on domain member workstations initially, and I would like to push out a current client through SMS.
What issues can I expect when encountering old installations, already existing installations, and partial installations? What should I look out for? What are the best practices?