I working with PowerPoint 2010. When I save my presentation as a 2003 format, my file is too large.
How can I decrease this size?
Assuming you have a large number of images or a number of large images (the usual reason for a presentation's file size growing excessively big), you can compress all images (and remove cropped areas) by doing the following:
you need to compress the pictures that you use in the powerpoint with any programme