Take a moment to look at this detailed table of security update availability by platforms and brands. There are a few interesting take out here. First. no surprise, Apple is the leader in keeping their platform secure. Second, I see a few players that are no longer in business: Windows and Essentials. Surprisingly, Microsoft/Nokia was the second, just behind Apple. Third, Apple keeps updating their devices twice longer than all others. On this matter, look at the Android landscape, they don’t bother keeping their customer in security because they hope you’ll change your device before it becomes critically unsafe to use. Even Google doesn’t do well in that respect for their high end devices. Finally, by controlling the whole stack, side stepping the carriers, Apple is able to push updates faster than all others.