Microsoft's new Outlook for Windows has been transformed into a data collection and ad delivery service, sharing user data with 801 third-party partners. The service uses data for targeted advertising, and users are prompted to choose how ads appear on their screen. Microsoft's data collection includes personal data such as name, contact information, and location, which is used to provide personalized ads and content. The company's shift towards data-driven advertising has raised concerns about user privacy and the potential for surveillance capitalism.