Les, at a guess, the email of the Word doc would be corrupt because the recipient doesn't have the music character fonts installed.

If your project is on-going, or is important enough to warrant new software, Melody Assistant can export music scores as bmp files. It can import abc and midi files which I assume you can export from Noteworthy?
If your graphic has to be jpg an imaging program can then convert the bmp for you. Long-winded process isn't it. :)