I'm seeing the same issue - Doesn't seem to matter which OS - Windows 7, XP Pro, XP home - all have the issue. I never had this issue with 4.8. Now it is a daily occurrence. I have also noticed that when closing outlook, sometimes can't start it. I have to kill outlook.exe process. Then outlook 2007 starts, but the avast! antispam addon is disabled. I've got this on a clients pc's and I don't want to constantly monitor their machines for this issue...bad enough I have to do it for my own machine. I've searched the forum for solutions, but haven't seen any resolution.