The forced obsolescence of consoles is amazing. Now the new generation is advertising as one of their major achievements the retro-compatibility with the previous generation games, but what about PS3 or 360 games? Don't worry, you will have the option to pay again for the same game, maybe with new textures (but maybe not). At the same time, on PC I can play almost any game it has existed in PC history.
There's a pretty good list of backwards compatible 360 games that can be played on the modern Xbox consoles. Microsoft did the work in this case. Since it's different architectures there's a bit of work involved in making sure the compatibility layer works as expected. It's a technical achievement that they've been able to do it as good as this. There's also OG Xbox games available with a compatibility layer as well.…
This race condition allowed anyone spamming (3k+ req/sec) this one specific public API to eventually (2 minutes) take any unbanned inactive Xbox360 gamertag that hadn't been migrated to the XboxOne platform.
Xbox has no bug bounty program; ironically this means the finder of this exploit made 10x what Microsoft would had given him, even by a generous estimate.