This trick doesn’t work just for Outlook but any other application as well and unlike many other keyboard shortcuts, this one is quite easy to remember.
The Taskbar in Windows holds some pretty nice secrets and one of them is that you can use keyboard shortcuts to view and cycle through all of the open windows of a specific application. Is there an easy way to switch only between the open Outlook windows and messages? While I could use ALT+TAB to switch between them, the multitude of other application windows which I have open makes it quite cumbersome and also difficult to quickly select the correct one. For instance: the main Outlook window, the Reminders dialog and some emails. I often have more than one Outlook window open.