When you open an image that someone sends in an e-mail, it opens in the "Photos" app in Windows 8. This app is limited in what you can do with the image after opening. You can change the default program that opens images so that it is Windows Photo Viewer (the photo viewer that was used in Windows 7, Vista, and XP). This will allow you to work with images as soon as you open them, no matter how you open them.