Let me preface my comment by saying that I am very impressed with Avast!, and I have installed it on the computers of 4 of my friends who previously used Norton Antivirus and or Norton Systemworks. Although I am disappointed that there is no easy way to "exclude" Mailwasher previews from being scanned, it is not really a big deal, as I can configure Avast! manually. I was able to configure version 4 manually, but with 4.5 I will have to try and figure out how to do so.
The "Mailwasher" issue may seem trivial to some, but in my situation I have over 15 mail accounts and the amount of email processed through Mailwasher each day can be in the thousands. Yes I have a major spam problem. I also "trust" that Mailwasher is not vulnerable to malicious code. MW does not use rich text, which was mentioned as a possible future threat. I've also noticed that Avast! scanning of Mailwasher previews does not detect any viruses during the Mailwasher scanning, but when I download my messages via my email client, there are usually a couple of viruses that are caught by Avast!. This is not a criticism of Avast!, just an explanation of why I wish to exclude Mailwasher. I am definitely a "convert" and I am telling friends , family and associates about Avast!.
Keep up the great work everyone.
