Outlook 2011 not working offsite..

we are using Exchange 2007 and i can’t get my email to work off site using outlook for mac 2011. It work on site but when i try from my house it dose not work. I have it working on IPhone and IPad’s but can’t get it working on the macbook pro at all. I can’t us the mail app or out look. I know we use OWA to connect to outlook. I can use it on my PC at home and my pc laptop. All the mac laptop that use 2011 outlook can’t connect to exchange sever at home. The URL is Https://myserver.edu/owa