Set up Office 365 email in Outlook for Mac
Open Outlook for Mac. On the Tools menu, select Preferences.
If this is the first account you’re creating in Outlook, under Add an Account, click Exchange Account.
If you’ve previously created an email account for a different email address, in the lower corner of the Accounts dialog box, click New, and then click Exchange.
On the Enter your Exchange account information page, type your email address.
Under Authentication, make sure Username and Password is selected.
In the User name box, type your complete email address. In the Password box, type your password.
Make sure Configure automatically is selected, and then click Add Account.
After you click Add Account, Outlook will perform an online search to find your email server settings. In the dialog box that asks if you want to allow the server to configure your settings, select the Always use my response for this server check box, and then click Allow.
If Outlook is able to set up your account, you’ll see the account you set up in the Accounts dialog box.
Close the Accounts dialog box. If Outlook isn’t able to set up your account, see the next section in this article.
Help article: https://support.office.com/en-us/article/Set-up-email-in-Outlook-for-Mac-2011-d7b404a0-6e18-4d95-bed8-2de7661563ca