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It's our mail server that these worms/trojans are sneaking through to, as a matter of fact. And actually, so far we are getting updates despite lacking a renewed service contract.
explains a few things then... to be fair though there are a number of AV solutions that fall down at this point. Maybe you want to be thinking about setting up a filter to strip off certain attachments (any similarities in extension for example... zips are notorius for having viruses attached)... IIRC Phishphreek is rather good at this - may want to talk to him about it. Incidentally I think CA give you about 30 days grace before they stop you getting updates