Quick, how many file formats (types) can PowerPoint save your slides to? If you take count of every single format from the necessary to the rarely used (and forget the missing ones), then the number is 26. Some of these could be genuinely helpful, such as the MPEG-4 Video export and others like GIF, JPG, PNG, WMF, and EMF ensure that you get good graphic outputs. And RTF outlines can often be a blessing.
Explore various file types in the Save As dialog box in PowerPoint 2010 for Windows.
