I'm using Thunderbird as my email software and recently (not sure exactly when), it REALLY has slowed down when I move between emails or select an email to delete or move or whatever. This is only for unread emails. Looking at processes running when this occurs I see mcshield.exe taking up a lot of cpu so I assume it is something to do with real time scanning? This is very frustrating as it takes anywhere from 10 to 30 seconds to move down to the next email. Any advice would be appreciated.