Microsoft officially announced Halo 3 during the E3 conference, generating significant excitement for the upcoming installment in the Halo franchise.
Microsoft revealed the official release date for Halo 3, setting the launch for September 25, 2007.
Halo 3 was released worldwide, becoming one of the most successful game launches on the Xbox 360, with record-breaking sales and critical acclaim.
Within the first 24 hours, Halo 3 sold over 3 million copies in the United States alone, becoming the fastest-selling game at the time.