Pictures in earlier versions of Office
Effects applied to a picture cannot be edited in Office 2004 for Mac or earlier. Instead, effects applied to a picture become permanent when you save a file in Office 2004 or an earlier file format, such as Excel 97–2004 Workbook, and then open it in Office 2004 or earlier.
If you later save the file in the Office 2008 format or a later file format, you can edit the effects applied in Office for Mac 2011 or Office 2008.
You might want to remove effects applied to a picture, and then apply effects in an earlier version of Office.