OK - here's the story. I installed Comodo Antispam and after a bit of wrestling got it working OK (yes - evern with Thunderbird!). I then installed Comodo Antivirus and guess what - Antispam no longer wants to play. I now have an inbox full of garbage - but at least CAV tells me it's clean. I'm prepared to entertain the outrageous view that I may have messed up on the install and/or configuration - but I've no idea where. Any suggestions?