Apparently Microsoft sent only certain Xbox 360 owners the offer which appears on boot up of the 360. The company is running a new promotion that gifts its "very best customers" with a $75 promotional code if they buy an Xbox One or any Xbox One bundle. It appears that not everyone is eligible for the offer, with Microsoft only targeting a subset of Xbox 360 owners across the US ahead of its July 31st deadline. However, there's no word on whether the promotion will come to other countries. To find out if you qualify, turn on your Xbox 360 and make sure it's connected to Xbox Live. If you've been selected, you can order a (full-priced) console from any retailer and Microsoft will credit your Xbox account with $75, as long as you redeem your voucher code by October 15th.
If you qualify here is the message that will appear on your screen:
As our way of saying thanks we 're giving YOU, one of our very best customers, an exclusive $75 Xbox promotional code with the purchase of any Xbox One or Xbox One Bundle from Microsoft store or your local retailer. Your code can be used for games, add-ons, movies and more!
If you have been chosen to receive the offer, you can order a (full-priced) console from any retailer and Microsoft will credit your Xbox account with $75. You must however redeem your code by October 15th. The offer will at least cover the price of a game and or an accessory.