office mac 2011 outlook setup

We have mac book pro with outlook 2011 autherised version.I configured the exchange mail from internal network after network cable plugged.Put the local server name and its working..Whenever i reached at home,trying to connect through home internet.Its not connecting.Then i created one more account with the server name as webaccess server name, it is connected and at the office the second account is not connecting..So pls advice to me for create an account which has to be worked on internal network and at my home network.