Well for me as I am using Outlook 2007 and using encrypted connection setting in Outlook for both incoming and outgoing my avast is scanning every mail I get or send. It add a note in the last “avast incoming mail is clean”. Well the reason is avast has a plugin for Outlook 2007(Not sure about 2003) so that plugin makes it for avast to scan mail even if encrypted connection is activated but this would not happen in case of Thunderbird because avast don’t have plugin for it. So don’t use encryption in TB ;D ;D SIMPLE ;D ;D