Move Outlook Navigation Toolbar Back to Bottom From Side

 In a recent update of Office 365 applications the Outlook toolbar that switches between email, calendar and contacts was moved from the bottom-left to the top-left of the main window.

Here's how to move it back.

1. Open regedit
   
   
2. Go to the following registry key
   Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\ExperimentEcs\Overrides
   
   If you have the ‘Microsoft.Office.Outlook.Hub.HubBar’ string value and set it to ‘false’.
   Then click OK and restart Outlook.
   
   If  “Microsoft.Office.Outlook.Hub.HubBar” doesn’t exist, create it by right-clicking on Overrides in the left pane and selecting New, String Value then name it “Microsoft.Office.Outlook.Hub.HubBar”
   Set the value to 'false'
   
   
3. Close and restart Outlook