Normally, one discount code is only applied for one offer. However, If the users put a vast of items in their cart, it is easy to use one coupon code to purchase items. It depends on Microsoft Store's policy, you can contact Microsoft Store via mail for your reference.

To avoid this problem, you should check out carefully Microsoft Store promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

It depends! Normally, the percentage that you can save with that Microsoft Store Coupon will be shown right on the page, so you can see if it is applied sitewide or not. However, once you are not sure, try it right on their's products you want to buy.

Yes. Coupons for each Discount Event of Microsoft Store will be collected here while being updated day by day. Sometimes, there will be deals not updated promptly but it's rare, we expect sympathy from you.