Needham & Co. analyst Charles Wolf says that the combination of iPod and iTunes is causing more and more Windows users to switch to the Mac platform. “Although music suite sales were expectedly strong [in the third quarter], the upside surprise was due chiefly to stronger than anticipated sales of iBooks and PowerBooks,” Wolf wrote in a research note Thursday. “Apple’s music suite, consisting of the iPod and iTunes Music Store, is emerging as a Trojan horse that’s beginning to fuel a migration of Windows users to the Mac platform.”