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On the File menu in classic Outlook, select Account Settings > Account Settings.
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Choose the account you want to remove, then select Remove.
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To confirm the account removal, select Yes.
Tip: To delete a profile, see Remove a profile.
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On the View tab in new Outlook​​​​​​​, selectÂ
 View settings. -
Select Accounts > Email accounts.
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For the account you wish to remove, select Manage.
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Select Remove.