As a Council-certified Indoor Environmental Consultant I never recommend ozone generators for improving indoor air quality whether there is a mold situation or not. But, to keep things on your situation, ozone hasn't been shown to kill mold. For more information on ozone generating "air purifiers" see: http://www.arb.ca.gov.
Another learning source comes from the EPA: http://www.epa.gov/03healthtraining.
The second acts as an educational tool with a lot of good information to help educate people about these kinds of things.