Setting up Outlook Client for Send As usage from Secondary account

The FROM field on Windows Outlook is not turned on by default.

1. Click New Email in Outlook, a new window will appear
2. Select the Options tab, then click the FROM button in the ribbon

3. Once the From button shows, Click on the FROM drop down, and Select Other Email Address...

4. A popup window will appear, "Send From Other Email Address"
5. Click the From button and in the Global Address List, search for the shared mailbox:

6. Double Click/Select the shared mailbox, then click OK

7. Send yourself a test message. AFTER a message has been sent, the secondary FROM Address will appear going forward in the drop down.   
**These steps may need to be repeated if the user gets a new machine at some future point.