MAC - Outlook - How to add Office365 mailbox in Microsoft Outlook 2011 and 2016 for Mac
This document will teach you how to add Office365 mailbox in Microsoft Outlook 2011 and 2016 for Mac’s.
Issue: Someone wants to add Office365 mailbox in Microsoft Outlook 2011 or 2016 on their Mac.
Environment: Mac, Outlook 2011, Outlook 2016
Resolution:
1. The first time you open Outlook, (if it has not been configured with a mailbox already) you should get a screen similar to this:

Click on the box next to “Exchange or Office 365”
i. If you already have an account configured in Outlook, you will need to use the “Tools” menu to accesses this screen. Click on “Tools” then “Accounts” in the menu at the top of your screen.

2. In the window that appears, enter your information, and click on “Add Account” when finished:

Please note, your user name is your full email address.
3. The following box may appear. Click the “Always use my response for this server” checkbox, and then the “Allow” button at the bottom.

4. Your account should now be added. You can close the accounts window. It may take several moments to finish connecting to the mailbox. If the window in step 3 appears again, repeat step 3 as necessary.