xbox

How do you delete an xbox live account on an original xbox? I've had my xbox live account for nearly a year and it will renew itself at the end of this month. I've decided to scrap the account and just put the money towards an xbox 360, Halo 2 is pretty boring now. My only problem is that I can't see any obvious 'delete account' options in account manegment or any other part of the xbox live menue. So how do I delete my xbox live account?
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I know you can do it from the website.

www.xbox.com

Sign in and I'm SURE it's there..

[ace]

Yea it's definitely somewhere on the website, probably in billing or something and you can cancel your payment method. Not sure about deleting it, but I know you can cancel the payments.