Does the size of a PowerPoint deck cause you problems? You can reduce the size of a deck dramatically by deleting unused slide masters. Go to Slide Master View. Work from the bottom up. If you hover your cursor over a slide master in the thumbnails, a pop up will show you what slides use the master, or if it is not used. If not used, delete it. Funny feature about PowerPoint...if you copy a slide or set of slides from one deck into another, it brings along all of the related slide masters. I have seen decks that have three or more sets of the same slide master collections. By deleting the unused, I have reduced huge megabyte sized decks to kilobytes.