To add a shared mailbox to your folder list
Shared mailboxes that you have access to should automatically appear in your folder list within Outlook. If they do not, follow the steps below.
Go to the Mail app.
Right click on your name and select Add shared folder...
In the resulting box, type in the name of the mailbox (ex. CPFI if the mailbox is for cpfi@neomed.edu) and press OK. This should then add the shared mailbox below your list of folders.
To send a message and have it come from the shared mailbox (ex. cpfi@neomed.edu)
Compose a new message.
Click the ‘overflow’ menu (the three …), select ‘Show From’.
Click your name in the From box (it won’t appear to do anything), and then press the delete key on your keyboard to clear it out.
Type in CPFI (your organization name), when the suggestion appears click it.