If I buy a Home and Student Office 2010 for 3 PCs now, supposedly I will be able to get an upgrade to Office 2013 Home and Student on 1 PC for free. The question I have is what will happen to the other two PCs? Will they become deactivated? Even if I am not supposed to run the other two PCs with Office 2010 anymore, would it still work or does Microsoft de-activate it?? Any solid info on this would be a help.