As the PM for the Windows phone division, I would approach a relaunch by focusing on a few key strategies. First, I would conduct extensive market research to identify key trends and opportunities in the mobile phone industry. This would include analyzing user needs and preferences, as well as studying the competition to identify areas where we can differentiate ourselves. Next, I would work closely with the engineering and design teams to develop a product roadmap that addresses the key findings from our market research. This would involve prioritizing features and functionality that align with customer needs and that set us apart from the competition. In addition, I would focus on building a strong ecosystem of apps and services that are tailored to our users' needs. This would require working closely with developers and partners to ensure that our platform is robust and attractive to both users and potential partners. Finally, I would develop a comprehensive marketing and communications strategy to promote our new product and build awareness among potential customers. This would include targeted advertising campaigns, social media outreach, and other initiatives designed to build buzz and generate interest in our new product. Overall, I believe that a successful relaunch of the Windows phone division would require a comprehensive, data-driven approach that prioritizes user needs, differentiation, and a strong ecosystem of apps and services.