MS Outlook 2011 for mac crashed and will not reopen,

I have MS Outlook for mac updated version 14.6.7 installed on OS X El Capitan 10.11.6. The program suddenly stop responding and I was only getting spinning wheels. I could not even access the Finder and Force Quit the Outlook Application. I had to manually turn of the computer and restart. Once i restarted the computer the Outlook would not open. MS Word and MS Excel and other MS Office programs are working. How can i reopen MS Outlook again. 

thanks