Hi, not a problem...
1. why are you using Server Edition? Especially when the machine is not really used as server -- given your OE & Outlook set up...
2. to do what you want, start avast in the Enhanced User Interface, go to the Tasks folder, edit the Resident Protection task (choose it's Properties) and for each provider you want (Outlook/Exchange, Internet Mail), go to the Virus tab, remove the verb 'Interactive selection' and instead select something like Move2Chest, or Delete.
Hope this helps,
Vlk