2020

March

 * March 3: Halo: Combat Evolved Anniversary becomes available for The Master Chief Collection on PC/Steam.

May

 * May 12: Halo 2: Anniversary becomes available for The Master Chief Collection on PC/Steam.

July

 * July 13: Halo 3 becomes available for The Master Chief Collection on PC/Steam, alongside the launch of Season 2: Spark.
 * July 23: Halo Infinite ' s Campaign mode is showcased at the Xbox Games Showcase.

September

 * September 21: Halo 3: ODST is released for The Master Chief Collection on PC, with the addition of Firefight to the collection on all platforms and the launch of Season 3: Recon.
 * September 22: Halo: Shadows of Reach was originally set to be released, before being delayed until October 20th.

October

 * October 20: Halo: Shadows of Reach is released.

November

 * November 10: Xbox Series X and Xbox Series S are launched globally.
 * November 17: Halo 4 becomes available for The Master Chief Collection on PC/Steam.

December

 * December 29: The Art of Halo Infinite was originally set to be released, before being delayed until 2021.