Hermione, you are right on one point. You cannot delete an email without selecting it in Outlook, so for the viruses that are run simply by selecting the email you don't really stand a chance.
However, with this particular virus, it is contained in an attachment, which doesn't have to be opened with the message. I've gotten probably 200+ messages at work containing this virus and I'm not infected because I didn't open it. This one was very easy to avoid, taking the common precautions of not opening attachments from people you don't know or with a message that looks suspicious.