For those of you that use PowerPoint on a regualr basis, you may run into file size issues when your slideshow contains a high quantity of images. Here is a quick How-To that describes how to decrease the file size by tweaking the image formats

How To Reduce File Sizes by Changing Image Formats:

1. Save your PowerPoint file as HTML. In your save location, this will create a .htm or .html file and a corresponding folder with the same name. This folder contains all the images from the presentation.
2. Open the folder, and sort the files by size.
3. Find the largest images.
4. In PowerPoint, make sure that the image isn't grouped.
5. Select an image.
6. On the Picture Tools menu -> Under Adjust, Click Compress Pictures.
7. Right-click the image -> Click Save as Picture.
8. From the Save as type menu -> Select .jpg or .gif -> Save the image.
9. Delete the original image from the slideshow -> Reload the recently saved image in its place.
10. Regroup the images, if necessary.

A simpler way to decrease the image file sizes is to use third-party image editing tools such as PhotoShop or Microsoft's Picture Manager. Using these programs, you can scale your images and trim the resolution prior to adding the images to the PowerPoint slideshow. FYI, you can save the most space by using the .gif or .jpg formats for your images.