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HSSF (Horrible SpreadSheet Format ) – reads and writes Microsoft Excel (XLS) format files.

POIFS can therefore be used to read a wider variety of files, beyond those whose explicit decoders are already written in POI. Since all Microsoft Office files are OLE 2 files, this component is the basic building block of all the other POI elements. POIFS (Poor Obfuscation Implementation File System ) – This component reads and writes Microsoft's OLE 2 Compound document format.The Apache POI project contains the following subcomponents (meaning of acronyms is taken from old documentation): This link spurred controversy, some POI contributors questioning POI OOXML patent protection regarding Microsoft's Open Specification Promise patent license. A significant contribution for OOXML support came from Sourcesense, an open source company which was commissioned by Microsoft to develop this contribution. POI supports the ISO/IEC 29500:2008 Office Open XML file formats since version 3.5. Oliver and Marc Johnson) also noted the existence of the Hawaiian poi dish, made of mashed taro root, which had similarly derogatory connotations. This explanation – and those of the similar names for the various sub-projects – were removed from the official web pages in order to better market the tools to businesses who would not consider such humor appropriate. The name was originally an acronym for "Poor Obfuscation Implementation", referring humorously to the fact that the file formats seemed to be deliberately obfuscated, but poorly, since they were successfully reverse-engineered.