Use the appropriate link below for detailed instructions for your device.
It is up to the user if they want to use the Microsoft OUTLOOK App to send/receive email. The beauty of this app, is that you can switch from Mailbox to Calendar to Contacts and Tasks without leaving the app. In the Default mail app - it just knows MAIL, so you have to exit, and start Calendar, exit back to Mail...
Follow this link for information about downloading the Microsoft Outlook App.