By Paul Anderson -Oracle on Jul 22, 2013
Over the past several releases, Oracle Business Intelligence has supported Office 2007, Office 2010 and the newer Office XML file formats (*.xlsx, pptx, *.docx) . Customers are strongly encouraged to use the Office XML formats and the Microsoft Office versions that support those formats.
Starting with Oracle Business Intelligence 188.8.131.52, Oracle will begin removing functionality that supports Office 2003 products and file formats.
Read more and view the Statement of Direction at [Doc ID 1558215.1]: "Support of Microsoft Office 2003 with Oracle Business Intelligence Answers, Dashboards and Publisher OBIEE 11g"