Granted, the number of Trojans and worms targeting the Mac platform does not even come close to the number for Windows platforms. That said, some of the current malware is pretty destructive. Last year a Mac Trojan swept from machine to machine, forcing users to download bogus antivirus software. Earlier this year, Mac users were pummeled with two variants of a Mac-only iServices Trojan distributed via pirated versions of Apple's productivity suite iWorks and cracked Adobe Photoshop CS4 applications. The Trojans later developed into a full-fledged global botnet that infected more than 40,000 Macs. And experts say that Mac users can expect to see more drive-by and browser attacks.