If you have two mailboxes/accounts in Outlook, you can choose which mailbox to send an email from while composing a message:
- Start a new message by clicking the New Email button.
- While composing your email in the new window, click the From button and select the desired sender from the dropdown menu.


If the From button is not visible:
- Go to the Options tab in the message window.
- Enable the From button by selecting it.

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