Fix - Cannot start Microsoft Outlook. Invalid XML
Backup PST File Before Process.
Follow the steps below to clear and regenerate your Navigation Pane if you receive an error message that says "Cannot start Microsoft Outlook. Cannot open the Outlook window. Invalid XML, the view cannot be loaded."
To fix this error, run the Outlook.exe /ResetNavPane command:
1. Press 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.