Start by clicking the File tab on top of the Outlook window, then proceed to select Info from the left side bar. Once in the Info screen Click on Add Account.
When the “Add New Account” box opens, you will be prompted to enter your account information including:
Once you enter this information, click on Next.
Your account will now authenticate and finish configuring.
You may be prompted to allow auto-discover. Check the box by Don’t ask me about this website again. Click Allow.
After the configuration process completes, click Finish.
You will now be prompted to restart Outlook. Click OK.
Open again and log back in with your User Name: firstname.lastname@example.org and your password. Make sure to select "Remember my Credentials" before clicking OK so you are not prompted to enter your password in the future.