"Contacts and relationships. Data about your contacts and relationships if you use a product to share information with others, manage contacts, communicate with others, or improve your productivity. Biometric data and identifiers. Data about you resulting from specific technical processing relating to your physical, physiological, or behavioral characteristics which allow or confirm unique identification."
Microsoft collects extensive device data including contacts, biometric identifiers, keyboard/inking input, voice data, images, installed software, device identifiers like IMEI, and sensor data from devices like Xbox controllers and Kinect.