By not definitively defining how they collect and track iPhone users and their data, Apple got in hot water recently. To avoid running into the same problem, Microsoft clearly defined how they get that same data from their own mobile users, and how they use it, and even went so far as to release source code for their wifi data collection practices.
Microsoft released specific information regarding wifi and privacy, stating that it doesn’t intercept wireless data transmissions from user’s computers. It also doesn’t observe or record info that could potentially contain user content transmitted over the wireless network.