Offer valid from December 27, 2016 9:00AM PST, to January 31, 2017, 11:59PM PST, while supplies last. Available only in Microsoft retail and online store in the United States (including Puerto Rico). To receive full store credit towards the purchase of a new select Surface Pro 4 or Surface Book, customer must trade-in qualifying Macbook Air or Pro device (excludes iPads) subject to these terms. To be eligible for trade-in, you must own the qualifying device, device must power on, battery must hold charge and not be required to be plugged in to operate, and be in fully functional, working condition without broken/missing components, cracked display/housing, liquid damage, modification(s) or have device warranty seal broken to be considered working. Cannot be password protected, and include original chargers/accessories. Must contain hard drive. Any appraised value will be determined at trade-in and provided as a Microsoft online store redemption code and is valid online only. The online redemption code will be sent via email once CExchange receives and appraises your trade in. The redemption code will be valid until February 28, 2017. All trade-ins are subject to Microsoft's discretion and approval. All trade-ins are final. Recycle for Rewards program provided by CExchange, LLC., and other terms and conditions may apply. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or gift cards. May not be combinable with other offers. Void where prohibited or restricted by law. Microsoft reserves the right to modify or discontinue offers at any time. Limit of 1 offer per customer. Other exclusions and limits may apply.