When you open Outlook 2016 the program stays minimized and, once it does open, the restore feature, (the middle button in the upper right corner, next to the minimize button), does not work. When clicked the program minimizes to the task bar.
To resolve this there are two steps to take. First to open the program so the window is shown, right click the icon you use. Click Properties and then select to open the program maximized from the drop down menu in the Run section. Second, to reactivate the restore feature, right click on the start bar and click to Cascade windows. That will allow you to make the window smaller and move it around the screen.