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I believe the Hololens is custom silicon

https://www.anandtech.com/show/14775/hot-chips-31-live-blogs...

They have custom FPGAs in Azure to offload networking and storage from the host CPU. There's an internal team designing and deploying all these, and the eventual goal is to have all this on ASICs for even more efficiency. Though you are right that they'll be subcontracting out the actual fabrication.

Gotta be thinking they’re working on their own graviton given how much aws claims it’s saving them.

Xbox and Pluton, at least.

Both are specs though. AMD does the design according to Microsoft's requirements but you can't really call that silicon design on behalf of Microsoft.

Also, technically the SQ* chips (like SQ1 used in Surface X) are also Microsoft chips, though they look more like slightly tweaked / rebranded Qualcomm devices.