Apple today previewed its iPhone OS 4 software and released a beta version of the software to iPhone Developer Program members.
The iPhone OS 4 beta release includes an updated SDK with over 1,500 new APIs and over 100 new features that will be available to iPhone and iPod touch users this summer.
New features include Multitasking for third party apps; Folders to better organize and access apps; improved Mail with a unified inbox, fast inbox switching and threaded messages; enhanced Enterprise support with even better data protection, mobile device management, and wireless app distribution.
iPhone OS 4’s new multitasking offers users a new way to quickly move between apps, and provides developers seven new multitasking services to easily add multitasking features to their apps. These services include background audio, so apps like Pandora can play music in the background, and VoIP, so VoIP apps can receive a VoIP call even when the iPhone is asleep or the user is running other apps.