Microsoft Office 2011 I cannot log into my I-Mac

Hi 

My I-Mac 10.11.3 ( Updated 31/01/2016 )

I am using Microsoft Outlook 2011 on my desktop. I - Mac; all of a sudden I cannot log into to retrieve emails. I try and log in and it just shows the icon for a few seconds then vanished. However I am able to read emails that have been sent on my I-Pad, Macbook and phone. E-mails that have been sent already I cannot see on my other machine. 

I have tried rebooting and reseting NVRAM - all to no avail. I am stressing a bit as there are some important emails that came through and I need to reply and I have no way of accessing Outlook - any suggestion, ideas please? 

I do not have a disc to reboot. Any advise? I need to access the emails as there are important emails which I saw and have nor replied to. I hope this is as clear as I can make it.

Thanks ( and yes I am desperate ) 

Anthony.