In cases where Outlook seems 'stuck' opening you usually get messages such as processing.
This method is useful this cases like these.
> Press the windows button and type 'Run' - open this programme
> Type 'outlook.exe /safe
> Click enter
This should now open Outlook in Safe mode.
Once open let it run for 2 mins then close it. Wait 30 seconds and re-open Outlook from your normal link.
If you continue having issues please contact support.