Office 365 Email Setup - Outlook 2016 (Mac)
On the setup page, click Add Account.
Click the account type you want to add:
Click Exchange or Office 365 to add your work or school email account.
Click Other Email to add your personal, online email account, like Outlook on the web, Google, iCloud,
Enter your account information and click Add Account.
This image shows the account set-up page for Exchange or accounts with Office 365
NOTE Make sure you use your email address for both the Email address and User name fields.
All the accounts you add will show in the left pane.
TIPS You can add more email accounts from the TOOLS tab.
TIP To delete an account, in the left pane of the Accounts box, click an account, and then click Delete .