This IDC Forecast Update presents a cumulative update of the worldwide handheld device market based upon the latest outlook from IDC's Mobile Device Technology and Trends research group. Handheld forecasts are updated on a quarterly basis. All forecasts in this document supercede the previous forecasts contained within Worldwide Handheld Device 2006?2010 Forecast Update: July 2006. Note that we have changed the format of the presentation of data in the document. Specifically, we are reducing the numbers of tables presented, and collapsing the keypad-based and pen-based categories.