Here's another frustration in learning Microsoft Office's new ribbon interface. I wanted to compress my PowerPoint images -- something I've always done to reduce the file size of my PowerPoint. I searched and searched for some indication of how I might do this.
I finally discovered that I must select an image, and magically a new menu appears. The words "Picture Tools" appears in the Title Bar, and below it is a Format menu. Upon clicking Format, I revealed several options for manipulating the image, including "Compress Pictures".
The Microsoft website covers file compression and other picture manipulation functions.