Offer valid from 9:00 PM PST on December 16, 2017 to 11:59 PM PST on December 31, 2017, while supplies last. Available only in Microsoft retail and online store in select markets. Offer valid only on HP Windows Mixed Reality headset after purchase of Dell Inspiron Gaming Desktop. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or promo code(s). May not be combinable with other offers. Refunds will take into account the discount. Price discount does not include taxes, shipping or other fees. Void where prohibited or restricted by law. Microsoft reserves the right to modify or discontinue offers at any time. Other exclusions and limits may apply.