https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other/cannot-start-microsoft-office-outlook-cannot-open/349deb25-53eb-4ad1-82f7-854c2645759e
1. Open the Run command via Start-> Run or press the Windows Logo + R on your keyboard.
If you are using Windows Vista or Windows 7, you can also open the Start Menu and use the Search field to type in for the next step.
2. In the box you opened in step 1, type;outlook.exe
3. Press the SPACEBAR once, and then type a forward slash mark (/) followed by the switch you want to use (see the list below). For example, if you want to use resetnavpane the command you type in the Open box should look like this:
outlook.exe /resetnavpane (note the SPACE)
4. To run the command, click OK.