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This gallery shows you a glimpse of Facebook Messenger for Windows. To start, you'll need to login to Facebook by clicking on the blue "Log In" button.
See also: Facebook Messenger for Windows leaks by Emil Protalinski
After clicking on the button, you will be redirected to the facebook.com/desktop/login webpage where Facebook explains that Messenger for Windows requires you stay logged in so that it can deliver chat and notification messages to your desktop. This means you will stay logged into Facebook even after you close your browser. To log out of Facebook, you'll need to choose the "Log Out" option from Facebook's account (▼) menu.