OWA is a browser add-on that needs to come from the Exchange Server. So access via OWA is setup in Exchange by the IT-guy who manages Exchange server. Then you simply use your browser to browse to the url he gives you and you've got your business mail at home.
But you should be able to configure an Exchange account in standard Outlook. Here also the system manager can tell you the settings. And he might need to do some security settings to give you Access.
If it's mail on an MS Exchange server of your company, you need the help or instructions of the companies IT-staff to set it up on a laptop. What's wrong with that idea?
I have tried and tried to set up outlook on my laptop to access my email account through Outlook Web Access. If I can access through my smartphone setting up an exchange account, why is it so difficult using outlook on the laptop? Can you help?