The OS can be licensed at three different levels, depending on which advanced features your device requires: • Windows CE Core — ideal for low-cost devices, such as gateways, entry-level voice over IP (VoIP) phones, industrial automation equipment, and consumer electronic devices such as CD players, digital cameras, and networked DVD players. • Windows CE Professional — the full featured OS including email, browser, media player, RAS and thin client capabilities. Windows CE Professional Plus — the full Professional version plus File Viewers that allow a user to view and print native Microsoft Office and Adobe Acrobat documents.