I received a $100 Google AdWords Express coupon code in the mail today. I already have Google AdWords. Can I apply my AdWords Express coupon code to my AdWords campaign, or is it only for AdWords Express?
Google coupons can only be applied to new AdWords accounts that are under 15 days old. You cannot apply the coupons to any existing accounts or campaigns. If it's an AdWords Express coupon, then you'll have to create an AdWords Express account in order to activate it.