In last week Outlook will suddenly freeze, needs to be repeatedly force to quit. Now today mail will not send. I also sometimes 'lose' the window (it just disappears) but clicking on icon will not open it again-to which I have to Force Quit again. I have reinstalled accounts but still an issue. Also did a repair of permissions. I did upgrade OS to 10.11.1 and this started to appear afterwards. Error messages are 

server timed out or 'uknown error occurred"