Guarantee genuine. Not MSDN / Bulk Sale copy. Singapore retail boxset- contains product key. Selling multiple copies at cost, leftover from sale event. All BNIB sealed local copy. Retail price S$148, selling at $99. No further discount pls. Office 365 subscriptions are stackable up to 5 years, take advantage of this offer! Let me know if any questions - will be glad to help! Thank you!