Or, Cannot open the Outlook window?.
Solution:-
To resolve this problem, use the following steps.
1. On the Start menu click Run.
2. In the Run dialog box, type the following
command:
Outlook.exe /resetnavpane
Outlook.exe /resetnavpane
Note: There is a space
between "Outlook.exe" and "/resetnavpane"
3. Click OK.
Now you can Start MS Outlook…