Q: If you manage multiple mailboxes, how do you change the from in outlook?
A: To send email, reply, or forward email as a different address (i.e., firstname.lastname@example.org) vs. yourself,
Click on the From button.
Click on Other Email Address.
In the From Box, type email@example.com Click OK.
You should see the From address has changed (temporarily) and firstname.lastname@example.org has now been added as an option in your From list.