In November 2003, Microsoft starting the released for developer Windows Mobile Longhorn was the news codenamed is <nowiki>"Crossbow"</nowiki> coming on January 2004, at the Mobile World Congress on November 20, 2003, where the mistaken for Windows Mobile Longhorn, in December 17, 2003, the Windows CE 5.1 Tablet has been available for Microsoft, based for Windows Mobile Longhorn Beta.