Microsoft just dropped us a quick note to let us know that Windows Phone 7 has officially hit release to manufacturing (RTM) stage. As the note states: “The operating system has been finalized and is being delivered to partners around the world who will continue the work of integrating software with their hardware and networks to create amazing devices for customers by holiday season 2010.” Microsoft’s corporate vice president of Windows Phone Engineering, Terry Myerson, had this to say in the blog post announcing the feat: “Windows Phone 7 is the most thoroughly tested mobile platform Microsoft has ever released. We had nearly ten thousand devices running automated tests daily, over a half million hours of active self-hosting use, over three and a half million hours of stress test passes, and eight and a half million hours of fully automated test passes. We’ve had thousands of independent software vendors and early adopters testing our software and giving us great feedback. We are ready.” We’re ready too, Terry. Bring on the WP7 devices!