Last Friday I mentioned the story of the overly-viral Starbucks email coupon. The company had sent a few employees an email coupon and allowed them to pass it on to some family members and friends. But those coupons wound up getting forwarded all over the place, leading Starbucks to pull the promotion. Now Caribou Coffee has announced they will be accepting those Starbucks coupons, but only for a limited time. If you have a coupon you never were able to redeem, visit a Caribou location on Friday, Sept. 8th between noon and close of business and you can get one of three of Caribou's iced drinks for free. What a great way to get some otherwise loyal Starbucks customers into Caribou stores.