When I saw this in my yahoo account (in only one of the three accounts I used, which was fishy in itself) It just had a silly feeling to it. Anything that Yahoo would be doing with this would likely be tied to Norton. Also, it's odd that they would be sending zip files considering that is a rather popular way to spread viruses. Though I did have Yahoo's Norton scan it without downloading and is came up as clean. now THAT was scary!