If you’re looking to give Microsoft some feedback about Windows 10 Mobile, and the native apps that come with it, you should use the new Windows Feedback app. The Windows and Windows Phone UserVoice feedback sites that are currently employed for this task will shut down after November 16th.
Feedback sent through the app is accessible to Windows engineers, allowing them to respond quickly to comments. The app also allows engineers to engage in two-way conversations with Windows Insiders. Those who have given feedback can check with the app, to see if Microsoft is ready to act on their comments.