Microsoft will be targeted last, [0] with good reason. (They know how to avoid anti-trust scrutiny the best).
This is why Google, Apple, Amazon and Meta have all been targeted first, before building a huge case for Microsoft.
Again, it won't be easy as the FTC and the DOJ have failed to break Microsoft up many times.
What would be the actual case against them these days? They've lost their dominant position in nearly everything except desktop OS, if they're being anticompetitive they're doing a pretty bad job of it.