A pilot program in Chile, Italy, Spain and Turkey will add a voluntary update to Microsoft Office to remind users if their copy of the program is a pirated copy(or if Microsoft thinks it is invalid).

Cori Hartje, Worldwide Director, Microsoft Genuine Software Initiative says:

“Recently, I was corresponding with a customer, Linda Elmenhorst in the U.S., about her experience being defrauded by counterfeit software. She purchased what she thought was a legitimate package of Microsoft Office for her business. It wasn’t until she went online to get the free Microsoft updates and downloads for Office that she discovered through the Office Genuine Advantage program she had inadvertently acquired non-genuine software. Frustrated and irritated by her experience, she reported her non-genuine software to Microsoft and we were able to provide her with a genuine copy of Microsoft Office that she still uses today.”

source: Microsoft

Those duped by counterfeiters may qualify for a free copy of the software they purchased. My guess is that this only applies if they reveal the source and possibly only if the source gets arrested/convicted.