form factor similar to a PC-esque PDA like WinPad, with communications functionality like Pulsar. Under the name Handheld PC, a hardware reference guide was created and devices began shipping in 1996, although most of these device bore little resemblance to the goal of a pen-based touchscreen handheld device. A specification for a smaller form factor under the name Palm-size PC was released in 1998. Pocket PC 2000 Pocket PC 2000, originally codenamed "Rapier", was released on April 19, 2000, and was based on the Windows CE 3.0 kernel. Pocket PC 2000 was the debut of what was later to become the Windows Mobile operating system, and was meant to be a successor to the operating system aboard Palm-size PCs. Backwards compatibility was retained with such Palm-size PC applications. Pocket PC 2000 was intended mainly for Pocket PC devices; however, several Palm-size PC devices had the ability to be updated also. Furthermore, several Pocket PC 2000 phones were released (under the name Handheld PC 2000), however at this time, Microsoft's "Smartphone" hardware platform had not yet been created. At this time, Pocket PC devices had not been standardized with a specific CPU architecture. As a result, Pocket PC 2000 was released on multiple CPU architectures, such as SH-3, MIPS, and ARM. The only resolution supported by this release was 240 x 320 (QVGA). Removable storage card formats that were supported were CompactFlash and MultiMediaCard. Infrared (IR) File beaming capability was among the original hardware features. Aesthetically, the original Pocket PC operating system was similar in design to the then-current Windows 98, Windows 2000, and the yet-to-be-released Windows Me desktop operating systems. Crucially, the Pocket PC had a less cluttered interface more suitable for a mobile device, unlike the interface on predeceasing Palm-size PCs. Mainstream support for Pocket PC 2000 ended on September 30, 2005, and extended support ended on October 9, 2007. This initial release had multiple built-in applications, many of them similarly branded to match their desktop counterparts; such as Microsoft Reader, Microsoft Money, Pocket Internet Explorer and Windows Media Player. A version of Microsoft Office called Pocket Office was also bundled and included Pocket Word, Pocket Excel and Pocket Outlook. Notes, a note-taking app saw its first release and would be supported by most later versions of Windows Mobile. Intelligent character recognition support allowed Notes to distinguish styles of handwriting to be learned by the OS during processing to