Add one or more email accounts in order for them to be viewable from within Outlook.
1. Select the Tools tab.
2. Click on the Accounts icon.
3. In the Accounts window select the + sign then select New Account...
4. A new window will display asking you to enter your e-mail address, and then your password for the new e-mail account.
For the most current information on adding additional email accounts, please reference the following Microsoft help article: https://support.microsoft.com/en-us/office/add-an-email-account-to-outlook-6e27792a-9267-4aa4-8bb6-c84ef146101b#PickTab=Outlook_for_Mac