iOS 4.2 marks the first time that all of Apple’s mobile devices are sitting at the same OS table. This unification brings a handful of key new features to all three devices, but it also finally catches the iPad up with Apple’s other mobile devices. This is the first time that users of Apple’s tablet can revel in major iOS 4 benefits like multitasking, folders, and a unified Mail inbox—features that iPhone and iPod touch users have enjoyed since June.