When you install MM for the first time, you get only a limited number of MP3 conversions. It should have been giving you a message each time telling you how many you had left. You will need to purchase a license for unlimited MP3 conversions. Go to...
Help (menu) > Update program / Upgrade functions > Activate additional functions > Activate MP3...
cindytiger wrote - "I bought the full product. There is no option for activate additional options! I am going to be pissed off if that is not apart of this program. All other products have the capablitily of converting your tracks to MP3 or WAV."
So should this one. Have you ever been able to export as an MP3? If not, you may want to contact MAGIX tech support.