Add an account
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In classic Outlook, select File >Â Add Account.
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Enter the email address you want to add, then select Connect.
 
Change an existing account
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In classic Outlook, select File >Â Account Settings >Â Account Settings.
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Under Name, select the account you want and select Change, and then update the account as needed.
 
Add a mailbox
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See Add a mailbox.
 
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In new Outlook, on the View tab, select View settings.
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Select Accounts > Email accounts.
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To add an account, select  Add Account, select an email address, and select Continue.
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To change an existing account, select Manage on the account you want to change, and then update the account as needed.
 
In Outlook for Mac, select Outlook > Settings > Accounts.
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To add an account, select (Add an account) > Add an account, enter an email address, and select Continue. Follow the on-screen prompts to complete the process.
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To change an existing account, select the account you want from the list on the left, and then update the account as needed.