Open and Use a Shared Mailbox in Outlook for iPhone/Android

If you want to monitor the email from your primary mailbox and the shared mailbox at the same time, use this method. After you complete this task, the shared mailbox and its folders are displayed in the left navigation pane each time you open Outlook on your mobile device.

First, open Outlook on your mobile device and tap the circle at the top left. Once tapped, you will see the screen below.

Tap the envelope with the + as seen in the screenshot below.

Tap "Add Shared Mailbox"

Enter the full email address of the shared mailbox

Once added, you will see the shared mailbox in the Outlook menu.

If you need to add more shared mailboxes, repeat the steps.

Tap the email address on the "New Message" window to open the drop-down menu showing the email addresses you have available to "Send As".