After your email migration is complete, you'll now have easier access to OWA through the Campus Single Sign-On (https://sso.csulb.edu) service.
Login to SSO by navigating to https://sso.csulb.edu. Login with your campus credentials.
Select the Outlook chiclet to access OWA. Once you click on the Outlook chiclet, you'll be taken to your email inbox without the need to login again.