According to Neilsen Soundscan Mariah’s Christmas classic All I Want For Christmas Is You has sold 2,073,000 digital downloads making it the # 1 digital selling holiday song! The next best-selling holiday song on Billboard’s Holiday/Seasonal chart is Christmas Eve/Sarajevo 12/24 by Trans-Siberian Orchestra, which has sold 864,000 copies to date.
Source:Mariahcarey.com