I also received a virus attachment in a .zip file yesterday which Avast mail scanner did not pick up during the download.

Being suspicious of it I did a manual scan of the attachment and it then detected the virus. I too would have expected it to be automatically detected during the download process.

Running Avast4 Home
All providers running and set at “HIGH”
All mail accounts being routed to Avast scanner (checked that server set to 127.0.0.1)
Using Win98 with OE6

Also have Kerio firewall running if that is a factor.

Cannot remember the name of the virus, because I deleted it.