On Xbox and Windows Store, “Halo Wars: Definitive Edition” is an Xbox Play Anywhere title meaning a digital purchase of the game on either platform will provide the other version at no additional cost.
For Steam, there is full support for Steam Achievements and multiplayer will use a server browser where anyone can create and host games for others to search and join.
“Halo Wars: Definitive Edition” will cost $19.99 USD.