It's actually a brilliant synergy. LinkedIn was limited to a revenue model around HR, recruiters, and individuals buying subscriptions to different views of their core service. They weren't in the business of building CRMs, enterprise email solutions, or operating systems. And yet those very systems are the ones where people most natively would want to ask "what is the context and history of the person I'm connecting to?"

Beyond the expansion in potential revenue models, it's rational for Microsoft to spend their cash on things that cement their dominance in the workplace, particularly as Apple and Google could always choose to make a hard push into that space. Assuming LinkedIn continues to dominate as a professional network, Windows 15 Powered By LinkedIn is a hell of a moat to cross.