What is a best practice for managing clients with Symantec AntiVirus 9.x, 10.x, and 11.x, if you assume that the clients cannot be upgraded all at the same time?
The best practice for managing a combination of Symantec AntiVirus 9.x/10.x and Symantec Endpoint Protection 11.x clients is to install the Symantec Endpoint Protection Manager and Console on different computer than Symantec System Center. You can then migrate your legacy Symantec AntiVirus clients (that are supported) to Symantec Endpoint Protection 11.x in stages. You should read the Migration Overview and Sequence section in the Installation Guide for Symantec Endpoint Protection and Symantec Network Access Control.