Xbox One headset compatibility confirmed; will have adapter to use Xbox 360 headset

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Chark said:

Stinky said:
Micro-USB - 3.5mm jack adaptors are cheap and available already.

That probably won't work since that port is probabaly for charging only. The audio out is proprietary from what I understand.

The front Micro USB jack is for connecting to the console for charging or using in a wired context.

The rear jack is for accessories. 

The reason the Xbox 360 and now the Xbox One don't use a 3.5mm headphone jack is so you can connect additional accessories to the device without requiring a second port on the device or some bastardized method of connection.  The Xbox One's mic input is also digital, not analog, providing a better sound quality than you'd receive with an analog 3.5mm device.

A reasonable argument may be "Why did the Xbox 360 use a proprietary connector?" and I doubt we'll ever get that answer, but Micro USB is a standard connector on the Xbox One for the reasons I mentioned.