WEBppliance has not conducted sufficient testing to recommend a specific AntiVirus product. There are some known issues with Norton AntiVirus and one is given below.
When Norton Antivirus is installed and also email protection is enabled on the system then the process POPROXY.EXE is put in the "Run" key in registry. Hence, whenever,someone logs onto the system (either physically/through terminal services), this executable starts.
POPPROXY.EXE has compatibilty issues with some API`s which Webppliance uses to update the POP and SMTP server about the change in configuration.
So in order for webppliance to function correctly the email protection feature of norton antivirus software has to be disabled .