Task:
Changing the 'Send As' option in Outlook.
Prerequisites (if applicable):
Outlook desktop client and access to multiple inboxes.
Instructions:
- Launch Outlook, then from the top left-hand corner, select New Email:

- In the new message window, select Options:

- From Options, select From. This will now display a From button with a drop down menu:

- Select the From button, then select Other Email Address:

- Type the email address you would like to send from and select OK:

- The email address will now be saved under the From button for new, replies, and forwards:

Outcome:
You will now be able to select which email address to Send As in Outlook
Further reading:
N/A