4 Ways to Reduce Powerpoint Size
This is a short list on how to reduce powerpoint size. Allowing you to transfer your presentations via email.
1. Use PPTX Format Rather than PPT Format.
Using the PPTX format is smaller and can reduce your powerpoint size.
2. Export the File as a PDF
3. Instead of Embedding Big Files Use Hyperlinks
Instead of embedding videos use hyperlinks like to youtube to reduce file size.
4. Compress Your PowerPoint Images
This option is located within Picture Format Tab.
Source: http://www.cbsnews.com/news/4-ways-to-shrink-powerpoint-decks-down-to-size/