https://news.xbox.com/en-us/2020/05/21/sea-of-thieves-coming-to-steam-on-june-3/
https://store.steampowered.com/newshub/app/1172620/view/3323039031717563803
Do I have to be running Windows 10 to play?
Yes. For this game to work, users must be running the Windows 10 operating system.
Is the Steam version included in cross play?
Yes! Players will be able to crew up and play together regardless of which platform they’re on, so those already playing on Xbox One and Windows 10 will be able to play with friends on Steam.
Will game progress carry over to Steam?
Yes! Your ranks, cosmetics and currency will all be there after you sign into your Xbox Live account, meaning you’ll be able to pick up exactly where you left off. Previously earned achievements will automatically unlock on Steam too.
Will this game be locked to 30 frames per second?
No. FPS will be uncapped.
Do I get the game for free on Steam if I already own it?
No. Players on Xbox One and Windows 10 will not receive an entitlement to a free Steam copy. However, cross play breaks down barriers by enabling new Steam players to crew up easily with existing players on Xbox One and Windows 10.