AmiMoJo writes: According to data from Secunia, Apple's software for Windows is now the biggest threat to PC security, surpassing previous long term champion Java. Among U.S. users, some 61 percent of computers detected running QuickTime did not have the latest version. With iTunes, 47 percent of the installations were outdated versions. There were 18 vulnerabilities in Apple QuickTime 7 at the time of the study. Oracle has now fallen/risen to 2nd place, followed by Adobe. All three vendors bundle automatic updater utilities with their software, but users seem to be declining new versions. Update fatigue, perhaps?