Halo Infinite doesn't have cross-save if you buy it on Steam
Your save says goodbye, and I say Halo.

surprise multiplayer release several weeks ago) is that the cross-save functionality with consoles only works if you've bought the game via the Microsoft store or Xbox Game .
This is a bit bizarre. PC Gamer tested this by loading up Infinite on Steam using the same Microsoft that had been used on an Xbox Series X to play the campaign. An achievement popped and an 'end current session to play here' notification appeared, but the save isn't there.
This may only affect a minority of players but does somewhat isolate the Steam version of the game, and feels a little like Xbox trying to nudge players in the Game direction. It seems like cross-save should be able to work smoothly across platforms when crossplay multiplayer does—and the Master Chief Collection is Forza Horizon 5's cross-save functionality doesn't work on Steam, either.
So if you're going to buy Halo Infinite and want to use the cross-play feature, careful where you buy it. Yes this stuff is stupid. I've ed Xbox PR about it and will update with any response.
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Rich is a games journalist with 15 years' experience, beginning his career on Edge magazine before working for a wide range of outlets, including Ars Technica, Eurogamer, GamesRadar+, Gamespot, the Guardian, IGN, the New Statesman, Polygon, and Vice. He was the editor of Kotaku UK, the UK arm of Kotaku, for three years before ing PC Gamer. He is the author of a Brief History of Video Games, a full history of the medium, which the Midwest Book Review described as "[a] must-read for serious minded game historians and curious video game connoisseurs alike."