Jawbreaker is among the preinstalled programs. GAPI was included with this release to facilitate the development of games for the platform. Other features/built-in applications included the following: enhanced Pocket Outlook with vCard and vCal support, improved Pocket Internet Explorer and SMS reply options for Phone Edition. Windows Mobile 2003 SE Windows Mobile 2003 Second Edition, also known as "Windows Mobile 2003 SE", was released on March 24, 2004, and first offered on the Dell Axim x30. It was based on the Windows CE 4.x kernel. This was the last version which allowed users to back up and restore an entire device through ActiveSync. This upgrade allows users to switch between portrait and landscape modes and introduces a single-column layout in Pocket Internet Explorer. It includes support for Wi-Fi Protected Access (WPA) and new screen resolutions: 640×480 (VGA), 240×240, and 480×480. It was powered by the same OS as with Windows Mobile 2003, which was Windows CE 4.20. Windows Mobile 5 Windows Mobile 5.0, originally codenamed "Magneto", was released at Microsoft's Mobile and Embedded Developers Conference 2005 in Las Vegas, May 9–12, 2005, and was based on the Windows CE 5.0 kernel. Microsoft offered mainstream support for Windows Mobile 5 through October 12, 2010, and extended support through October 13, 2015. It was first offered on the Dell Axim x51. It used the .NET Compact Framework 1.0 SP3, an environment for programs based on .NET. Windows Mobile 5.0 included Microsoft Exchange Server "push" functionality improvements that worked with Exchange 2003 SP2. The "push" functionality also required vendor/device support. With AKU2 software upgrades all WM 5.0 devices supported DirectPush. Other features included an enhanced battery-saving capability called persistent storage capability. Previously up to 50% (enough for 72 hours of storage) of battery power was reserved just to maintain data in volatile RAM. This continued the trend of Windows-based devices moving from using RAM as their primary storage medium to the use of a combination of RAM and flash memory (in use, no distinction between the two is obvious to users). Programs and frequently accessed data run in RAM, while most storage is in the flash memory. The OS seamlessly moves data between the two as needed. Everything is backed up in the flash memory, so unlike prior devices, WM5 devices lose no data if power is lost. New to 5.0, OS updates were released as adaptation kit upgrades, with AKU 3.5 being