2009

2009 was a busy year, with the release of Halo Wars, Halo 3: ODST, and much more.

January

 * January 29: Ensemble Studios is closed by Microsoft Game Studio.

February

 * February 26: Halo Wars is released in Japan and Australia.
 * February 27: Halo Wars is released in the PAL Region.

March

 * March 3:
 * Halo Wars was released in North America.
 * Halo Wars: Official Strategy Guide was released.

April

 * April 9: The first Mythic Map Pack is released.
 * April 15: Issue 4 of the Halo: Uprising comic book series was released.

May

 * May 12: The first Title Update for Halo Wars is released.
 * May 19: The Strategic Options Pack for Halo Wars was released, including the game modes Reinforcements, Tug of War and Keepaway.

July

 * July 17: The second Title Update for Halo Wars is released.
 * July 21: Historic Battles, the first map pack for Halo Wars, is released.
 * July 22: Issue 1 of the Halo: Helljumper series of comics is released.
 * July 23: The "HaloWaypoint" (Later @Halo) Twitter account was made.
 * July 24: The Announcement Trailer for Halo Legends is released.

August

 * August 26: Issue 2 of Halo: Helljumper is released.

September

 * September 7: The Life was released.
 * September 22:
 * Halo 3: ODST, alongside the Halo 3: Mythic disc containing all Halo 3 downloadable content (including exclusive early access to the Mythic II Map Pack), was released, along with the second Mythic Map Pack.
 * Halo 3: ODST Official Strategy Guide was released.
 * September 23: Issue 3 of Halo: Helljumper was released.

October

 * October 13: The Halo Encyclopedia: The Definitive Guide to the Halo Universe is released.
 * October 28: Issue 4 of Halo: Helljumper is released.

November

 * November 5: Halo Waypoint is released.
 * November 7: The Babysitter short film shown on Halo Waypoint.
 * November 21: The Duel short film is shown on Halo Waypoint.
 * November 24: Halo: Evolutions is released.
 * November 25: Issue 5 of Halo: Helljumper is released.

December

 * December 5: The Package Part One short film is shown on Halo Waypoint.
 * December 12:
 * The Package Part Two is shown on Halo Waypoint.
 * Halo: Reach Video Games Awards Trailer is aired live on the Spike TV Video Game Awards 2009.
 * December 18: The third Title Update for Halo Wars is released.
 * December 23: Issue 1 of the Halo: Blood Line comic series is released.

Unknown Date

 * Halo: Chronicles was officially canceled.