I know that Thunderbird is compatible with Avast but version .5 just came out and now I notice that when I download my mail from the server there is no icon in the sys tray working that it is scanning the mail anymore. I redid the e-mail program wizzard also. I also have the box checked to show this as well so it's not that. I also checked same mail account with Outlook Express and the icon in the sys tray works. Is Avast not compatible with the new Thunderbird? Any ideas? Thanks.