Problem:

When opening Microsoft Outlook Windows client, you receive the following error: 

"Cannot start Microsoft Outlook. Cannot open the Outlook window. Invalid XML, the view cannot be loaded." 

Opening Outlook in SAFE mode does not help, nor can this problem fixed by running repair or even by re-installing Outlook. 

Solution:

To fix this error, run the Outlook.exe  /ResetNavPane command:

1. Hold the Windows key and the R key at the same time.
2. The Run command window will open. Copy Outlook.exe  /ResetNavPane into the text field.
3. Click OK to run the command.

Running this command clears and regenerates the Navigation Pane for the current profile, removing all shortcuts and favorite folders from the Navigation Pane.