Learn how to save a file to the cloud, specifically SkyDrive.
See what happened to the Open dialog box in Office 2013.
See what happened to the Save As dialog box in Office 2013.
To learn how to open your presentation in PowerPoint 2003 or earlier, read this article.
You can save presentations as many different file types, such as JPEGs (.jpg), Portable Document Format files (.pdf), OpenDocument Presentation (.odp), and even as a video or movie (and more).