1. Launch Mail.
  2. From the Mail menu, select Preferences.
  3. Click + (Create an Account).
  4. Select Exchange.
  5. Complete the following, and then click Continue:
    Field What to do...
    Name Enter your name.
    Email address Enter your full account email address.
    Password Enter the password you set for your account.
  6. If you receive a warning that "Internet Accounts couldn't log in to the Exchange server...", complete the following and click Continue:
    Field What to do...
    Description Enter a description for the account.
    User Name Enter your full email address.
    Password Enter the password you set for your account.
    Server Address Type outlook.office365.com
  7. Click Continue.
  8. Select the applications you want to link to your Office 365 email address, and then click Done.