Save your file either to your computer, or to an online service like OneDrive (formerly SkyDrive). Then find out how to share it with others, even if they have an older version.
Use PDF or XPS format to help preserve the formatting in your file or to share the file with other people.
Save your PowerPoint 2013 presentations to OneDrive (formerly SkyDrive).
Save your presentation so you don't lose all your hard work, then print it to share it with others.