Step 1: Open a New Email in Microsoft Outlook. 

Step 2: Select the Options Tab.

Step 3: Select From in the Show Fields section. This will add the From field to your email. 

Step 4: Step 1: Select the From Drop-Down Menu above the To field.

Step 5: Select Other Email Address. 

Step 6: Select From. 

Step 7: Select More Columns.

Step 8: Ensure the Global Address Book is selected in the drop-down menu.

Step 9: Search for the Email Address you wish to send from.
NOTE: You will need to ensure you have access to send from that email address.

Step 10: Select Ok. 

Step 11: Select Ok.

 

Step 12: Continue Entering the rest of your email.