This document is a presentation about Apache POI given by Paolo Mottadelli at ApacheCon US 2009 in Oakland. It discusses POI modules for reading and writing Office file formats like Excel, Word and PowerPoint. It also covers topics like common HSSF and XSSF access in POI, OpenXML package concepts, text extraction, simple tasks in Excel and Word, formula evaluation, and use cases for content management systems, financial forecasting and document import.