Pino25 yesterdays, the Xbox live update happened that made the long awaited conversion of the Microsoft points to real currency. so if you have some points left in your Xbox live account it will be converted in a real dollar amount ruffly 80 MS points = 1$.
the conversion system, also aparently rouds up to the nearest quarter dolar, so if you have 0.45$ you would get 0.50$.
also for more information microsoft has posted a currency transition FAQ at
http://support.xbox.com/en-US/billing-and-subscriptions/account-management/microsoft-points-retire-faq
