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UPDATE FOR BI SUITE 3.6 INSTALLATIONS OR HIGHER:
Replace the Login.jsp ([Login.jsp|^Login.jsp]) and Navigate.jsp (Navigate.jsp) with the ones that found under attachments in this page.
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Other than the Login, Navigation, and Parameter Forms, no changes were necessary to the Pentaho Platform. This is due to the combination of Pentaho rendering in standard formats, and the iPhone being able to render standard HTML and PDF pages.
For more interesting iPhone apps visit http://www.intellectsoft.net