http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/02/27/unable-to-use-excel-2010-powerpivot-workbooks-in-excel-2013.aspxWhen you try opening an Excel 2010 PowerPivot workbook in Excel 2013 you will find that you are unable to manipulate the PivotTable. In addition, you will be prompted with an error message that asks you to upgrade the data model: However, when youen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/the_microsoft_excel_support_team_blog/archive/2013/02/27/unable-to-use-excel-2010-powerpivot-workbooks-in-excel-2013.aspx#3578926Fri, 14 Jun 2013 16:20:27 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3578926lauren<p>wow really? &nbsp;seems like this should be a software developer problem not a user problem.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3578926" width="1" height="1">