It says...
In order for Winners to be notified, they must have opted in to receive marketing communications from Xbox**.
** Amend your opt-in options by ticking the "Check this box if you would like to receive marketing mails, promotional offers, and the xbox.com newsletter" box at
http://live.xbox.com/en-GB/profile/profile.aspx.
Then the only options i can see are:-
Check this box if you'd want insider information from Microsoft.
Check this box if you'd like to share your information with our 3rd party partners.
Does that mean you would need to tick both? I mean the Microsoft one im Okay with but the other option scares me. Besides, what it tells you to do is different from what available as far as i can tell.