Hye All,I didn't have any experience on exchange but I have to install Symantec Mail Security on it.I have 1 edge transport server, 1 email hub server and clustered client access server for email.The thing is what is the best practises should I do during this installation.What step should I take to ensure this installation doesn't bring any problem later on.Thanks.

Make sure that you have latest version of it and supported on 64bit version of Windows and Exchange 2007. This should help you for deployment Planning Antivirus Deployment For installation steps you may need to refer antivirus product document. Make sure that File-Leve antivirus scaning has set proper exclusion... File-Level Antivirus Scanning on Exchange 2007