These steps are the same whether you’re adding your first email account or additional email accounts to Outlook.
For Outlook for Office 365 and Outlook 2016
Click on File > Add Account.
Click on Add Account
Enter your email address and click Connect.
Enter your password
For Outlook 2013 and Outlook 2010
Click on File > Add Account.
Click on Add Account
Enter your email address and click Connect.
Enter your name, email address, and password, and click Next.
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If prompted, enter your password again, then select OK > Finish to start using your email account in Outlook.