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If Outlook says it is loading but it doesn't finish loading, so it does not open up, you will have to open Outlook on safe mode. 

Step-by-step guide

Option 1:

1. Hit Ctrl + click the Outlook icon on your computer (make sure that you leave the Ctrl. button pressed until Outlook opens up). 
2. A pop-up window will open up asking: "Do you want to start Outlook in safe mode?"
   
3. Click Yes. 
4. At this point, Outlook will open but it will look a little bit different/strange. 
5. Exit out of Outlook.
6. Click on the Outlook icon to open it back up. 
   
   

Option 2: 

1. Choose Start > Run .
2. Type Outlook /safe , and choose OK .
3. In the Choose Profiles dialog box, accept the default setting of Outlook and choose OK.
4. If prompted, enter your password and choose Accept

 Now, Outlook should open up normally. 

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