Microsoft really wants you to buy a Surface device. So much so it’s willing to take that old MacBook off your hands in exchange for cold, hard cash. Or, more specifically, some money off the price of a new Surface.
Microsoft will give you up to $650 off the price of a new Surface device when you trade in your MacBook. The offer applies to both the MacBook Pro and MacBook Air, with the credit available on a Surface Pro 4 or Surface Book (excluding the new Performance Base models).
More information about the trade-in program can be found on Microsoft's website.