I updated to 14.3.6 yesterday and now when I go to close out of Outlook the program hangs. No error message no nothing. I have to go to activity monitor and force close the program. When I remove the shared mailbox everything works just fine. When I re-add it, Outlook wont close again. 

Both mailboxes are confirmed on Exchange 2013. 

I found the .hang log in the system console but its quite long. If it will help I can post it in a reply. 

Thanks everyone!!