Hi Irit,
   Sorry that I didn't respond sooner. LEAP is keeping me busy! I originally didn't create one whole power point presentation. I saved each child's work individually. They worked on laptops so I had to save each slide that they created. I then imported them into Photo Story 3. So I didn't save it as a power point presentation. However, since you can add sound automatically advancing slides in power point, I suppose you could achieve similar effects as a movie. However, Photo Story allows you to add title pages, different transitions, etc. But to answer your question I put a slide show together without the narration and music. My finished photo story project was 55.3 MB and my power point show was 2345 KB. Hope that helps!