Apple announces iPhone OS 4: Multitasking, folders, game center, more

Today, Apple announced its upcoming iPhone OS 4. To be released this summer, this update brings over 100 new user features to the iPhone OS. Some of the major upgrades include multitasking, folders-based organization, email updates (including a unified inbox and support for multiple Exchange accounts), iBooks for iPhone, more secure Enterprise support, game center (with achievements and social networking), and iAd mobile advertising. The full list of updates will apply to iPhone 3GS and third-generation iPod touch models; iPhone 3G and earlier iPod touch models will run "many things" However, these older models will not receive all features, most notably multitasking.