Using Office on a touch screen will get a whole lot easier soon. Microsoft has unveiled a new version of Office that gives each of its apps a mode built around use on a touchscreen — a feature that their predecessors quite noticeably lacked. The new version, which Microsoft calls a preview of a work in progress, looks quite a bit like the Office that was unveiled for the iPad just last week: apps have a simple bar on top, leaving most of the screen below for viewing documents. That said, the version Microsoft is showing on stage looks more full-featured than the stripped-back iPad app.