The aPriori Spreadsheet Report feature has been tested against Microsoft Excel 2010. In general, template-based reports work properly when the OS running the report supports the same version of Excel on which the spreadsheet report template is based. For example, if you build a spreadsheet report and create a template for it with Excel 2010, then you should use Excel 2010 to view it. Problems may occur when the two versions are mismatched. You should not use Excel 2007, for instance, to open a template created on Excel 2010.