Learn how to find the serial number on your Surface so you can register your product or request service.

Learn where to find the console ID, device ID, and serial number on your Xbox console.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to register your Xbox product so that you can request and track repairs, check your warranty service, and buy an extended service plan. There's also info on unregistering and unlinking your device.

There are a few easy ways to identify which Surface Pro, Surface Laptop, or other Surface device you have—either directly on the device or online after registering your serial number.

Activation is a technical process that pairs the product key or digital entitlement with the hardware configuration of the device. This does not evaluate the authenticity of the copy itself, and it does not …

If your controller isn’t working and needs replacing, enter the controller’s serial number at the bottom of this page. You can find the serial number inside the battery compartment, below the barcode.

Adding or registering a device to your Microsoft account helps you see its warranty status, get support, or request service. You can also find or lock it if it's lost. Select Register device to continue. Enter …

There are several ways you can find the serial number for your Microsoft or Surface device or accessory. Find serial number. Self-repair and the available replacement components are intended …

Documentation for troubleshooting common issues with Windows clients.

Many tasks for Office products don't require a product key because your Microsoft account takes care of them instead.