Now that the new Surface tablets have made their debut, Microsoft might be looking to add one more incentive to its trade-in program later this week. According to Forbes, “an inside source at Microsoft” said that the in-store exchange program will expand this Friday to include the iPhone 4S and the iPhone 5 at some Microsoft Stores in the U.S. and Canada. Microsoft will reportedly offer its customers a minimum of $200 for Apple’s phones, which is identical to the iPad promotion already in place. Keep in mind Microsoft is already offering to buy back Android and iOS devices via an online program, so it would appear that the company will soon have all its bases covered.