SmartArt feature in Word 2007 onward is very helpful, but the output is proprietary and only MS Office understands it. You might want to convert it to an normal image to use it at other places. I needed to do it to convert one of the books to e-pub. The conversion tool I was using could not handle the word art.
Office suite itself provides this feature, but not in Word. Copy paste the SmartArt to a powerpoint slide, right-click on it and select “Save as Picture” and there you have it! The SmartArt as an image. You have the options of various formats to choose from. Pick up the one you need.