According to one security vendor, Mac users are at a crossroads this year: if they prove to be as gullible as PC users, they will invite more attention by malware distributors. At a time when spiraling malware threats have bombarded PC users, Mac users have been able to kick back and relax. 2007 saw 5.5 million viruses -- including variants -- on the hunt for vulnerable PCs, meanwhile threats to Mac users remained minuscule by comparison: two. Still, the emergence of that pair has prompted speculation that Mac users will likely be targeted more in the coming year. If that...