After reading this article, students, faculty, and staff can remove an email account from the following desktop mail clients: Outlook for Windows, Outlook for Mac, Apple Mail.
Removing an Email Account from Outlook for Windows
Select File.
Select Account Settings > Account Settings.
Select the account you want to delete, then select Remove.
Select Yes to confirm.
Removing an Email Account from Outlook for Mac
Open Outlook.
Navigate to Tools > Accounts.
Select the account you want to remove, then click the minus sign (–) at the bottom left corner of the Accounts window.
Click Delete.
Removing an Email Account from Apple Mail
Open Apple Mail.
Navigate to Mail > Accounts…
Select the account you want to remove.
Click the minus sign (–) at the bottom left corner of Accounts window.
Click OK.