All faculty and staff members have an Exchange account at the main university. This is your @emory.edu email address. As a faculty or staff member you also have an @law.emory.edu email address which is aliased to your @emory.edu address. What this means is that you only have one email account at Emory but if someone were to send you an email to an "@law.emory.edu" email address it would still get to you as "@law.emory.edu" is an alias for your "@emory.edu" account.
To connect to Exchange using Outlook, follow these instructions.