2. Reduce the
Size of Your PowerPoint Files
You can easily decrease file size of your PowerPoint with lots of pictures in just a few clicks. Eventually the size of your files may be 50%~90% smaller, depending on the resolution of the original pictures. Here shows you the quickest way in Office 2010.
1. Open your PowerPoint files
2. Click "File Menu" and then "Save as"

3. In the save dialog box, click the "Tools" drop down menu
4. Select "Compress Pictures..."
5. Select "E-mail (96 ppi)" for minimizing the pictures' resolution

6. Click "OK"
7. Save your presentation to a new file name unless you don't want to keep the original file
8. Click "Save"
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