While you can view and work with presentations created in older versions of PowerPoint, you might get improved performance and additional features if you convert those presentations to the latest PowerPoint (.pptx) file format.
Click the File tab.
On the Info tab, click Convert.
After conversion, you are prompted to save the converted presentation. If the original presentation is a PowerPoint 97-2003 (.ppt) presentation, that original is preserved alongside the new file. If the original is a PowerPoint 2007 or PowerPoint 2010 presentation (.pptx), the file is replaced if you give the converted presentation the same file name and extension.
What if the Convert command doesn’t appear?
If the Convert command doesn't appear, the presentation content is up-to-date, and converting is not required. The Convert command appears only if one of the following is true about the presentation:
It was created or saved in the .ppt file format from Office PowerPoint 2003 or earlier.
It contains one or more diagrams or charts created in PowerPoint 2007 or earlier. This doesn't include smartartgraphics-singular.
It contains media objects, such as audio or video clips, created or inserted using PowerPoint 2007.
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