Setting up a Samsung SIII for an Exchange server can be a little tricky. But with these steps it will help you get it done.
First you want to click on your bottom right menu button on your phone you will get a menu, select settings.
Once in settings select add account.
Now select Microsoft Exchange Activesync.
On the Exchange server settings window you will want to use the same login and password that you would use when you login to your web interface or OWA to normally check your email. It is also the same domainusername that you use when you login to your PC. For the Exchange server name use the name in the URL from OWA.
Click ok on this next screen.
On the next screen you can set your preferences but here is a guide.
Once you have successfully set it up you now need to look for an email icon on your phone.