Setting up CSU Email on a Mobile Device There is some really helpful documentation available on how to set up your CSU email on your phone. Look at this section: Connect your Mobile Device to your Office 365 Account - Configure an Android Device to connect to Office 365 - Configure an iPhone or iPad to connect to Office 365 I don't believe that you need to install Outlook unless you want to keep the mail in a separate application. Please let us know if you're still having troubles after following the instructions linked above. Thank you!