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Microsoft 365 (Outlook Client for Windows) - Change the Account Listed in the From Field
If you have multiple accounts in Outlook, you can change which account is used to send a message. These instructions can also be used if someone else has has made you a delegate for their account and have set the permission levels to allow you to send messages on their behalf.
- Open up a new email or reply to a message.
- In the message window, above the To button, select From.
- If the From field does not appear, go to the Options tab at the top of the message and select the Show From checkbox in the Show fields section.
- Select the account that you want to use.