Halo on pc and gona be on steam.

https://store.steampowered.com/app/976730/Halo_The_Master_Chief_Collection/

 

Thanks Microsoft for not thinking about platform exclusivity and actually launch MCC to both MS Store and Steam. (looking at you epic)

 

Well its almost here.
https://steamcommunity.com/gid/103582791464211616/announcements/detail/1594765452632117404

 

While it's a necro Halo Infinite is on the steam store page. https://store.steampowered.com/app/1240440/Halo_Infinite/.