Apple today previewed its iPhone 2.0 software, scheduled for release this June, and announced the immediate availability of a beta release of the software to selected developers and enterprise customers.

The iPhone 2.0 beta release includes both the iPhone Software Development Kit (SDK) as well as new enterprise features such as support for Microsoft Exchange ActiveSync to provide over-the-air push email, contacts and calendars as well as remote wipe, and the addition of Cisco IPsec VPN for encrypted access to private corporate networks.

“We’re excited about creating a vibrant third party developer community with potentially thousands of native applications for iPhone and iPod touch,” said Steve Jobs, Apple’s CEO. “iPhone’s enterprise features combined with its revolutionary Multi-Touch user interface and advanced software architecture provide the best user experience and the most advanced software platform ever for a mobile device.”

The iPhone SDK provides developers with a rich set of Application Programming Interfaces (APIs) and tools to create innovative applications for iPhone and iPod touch. Starting today, anyone can download the beta iPhone SDK for free and run the iPhone Simulator on their Mac. Apple today also introduced its new iPhone Developer Program, giving developers everything they need to create native applications, and the new App Store, a breakthrough way for developers to wirelessly deliver their applications to iPhone and iPod touch users.

With the iPhone SDK, third party developers will be able to build native applications for the iPhone with a rich set of APIs, including programming interfaces for Core OS, Core Services, Media and Cocoa Touch technologies. The iPhone SDK will allow developers to create amazing applications that leverage the iPhone’s groundbreaking Multi-Touch user interface, animation technology, large storage, built-in three-axis accelerometer and geographical location technology.

Apple has licensed Exchange ActiveSync from Microsoft and is building it right into the iPhone, so that iPhone will connect out-of-the-box to Microsoft Exchange Servers 2003 and 2007 for secure over-the-air push email, contacts, calendars and global address lists. The iPhone 2.0 software supports Cisco IPsec VPN to ensure the highest level of IP-based encryption available for transmission of sensitive corporate data, as well as the ability to authenticate using digital certificates or password-based, multi-factor authentication. The addition of WPA2 Enterprise with 802.1x authentication enables enterprise customers to deploy iPhone and iPod touch with the latest standards for protection of Wi-Fi networks.

In addition to the set of iPhone OS APIs, the iPhone SDK also provides advanced tools for creating native iPhone and iPod touch applications including: Xcode for source code editing, project management and graphical debugging; Interface Builder with drag and drop interface creation and live preview; Instruments to monitor and optimize iPhone application performance in real time; and the iPhone Simulator to run and debug applications.

During the beta iPhone SDK program, a limited number of developers will be accepted into Apple’s new iPhone Developer Program and offered the ability to get code onto iPhones for testing. The Standard Program costs $99 (US) per year and gives members an iPhone SDK and development tools; access to pre-release iPhone software; technical support; the ability to get code onto iPhones for testing; and distribution of applications via the new App Store. The Enterprise Program costs $299 (US) per year.

In addition to these new iPhone network and security features, the beta iPhone 2.0 software provides several new Mail features such as the ability to view PowerPoint attachments, in addition to Word and Excel, as well as the ability to mass delete and move email messages.