Guide to setting up a shared mailbox in Outlook (New)

Step 1: Scroll down the left sidebar, hover over the Shared with me section and select the ... button to the right.

Step 2: Select Add shared folder or mailbox.

Step 3: Enter the name of the shared mailbox you wish to open and select the Add button.  The shared mailbox will appear under the Shared with me section.

Step 1: Scroll down the left sidebar and select the Add account button.

Step 2: Enter the name of the shared mailbox you wish to open and select the Continue button.

Step 3: Select the Done button.  The account will appear as a separate area underneath your personal email address.