With this you’re only testing the Standard Shield protection (you seem to have your sensitivity level on ‘High’) and not the Outlook plugin…
Do you see the X-headers of avast in any message?
About the icon: I’m not completely sure but the plugin does not have this option. The icon on the system tray ‘come’ from Mail Protection Wizard and depends of Internet Mail Provider (and not the Outlook plugin). Maybe the avast4.ini file configuration would not be read while the plugin tries to download the email :