Symbian is a discontinued mobile operating system (OS) and computing platform designed for feature phones and smartphones. It was originally developed as a proprietary software OS for personal digital assistants on June 5, 1997 by the Symbian Ltd. consortium. Symbian OS is a descendant of Psion's EPOC, and was mostly used on ARM processors, although an x86 port existed. A modified version of Symbian for x86 was used on the Fujitsu LOOX F-07C where it was dual booted with Windows 7. Symbian was used primarily by Nokia, and in select models of Samsung, Motorola, and Sony Ericsson devices. It was also prevalent in Japan, used by brands including Fujitsu, Sharp and Mitsubishi. As a pioneer that established the smartphone industry, it was the most popular smartphone OS on a worldwide average until the end of 2010, at a time when smartphones were in limited use, when it was overtaken by iOS and Android. It was notably less popular in North America in comparison to Windows Mobile and Pocket PC platforms.