Add a shared mailbox to Outlook Application Open Outlook. Choose the File tab in the ribbon. Choose Account Settings, then select Account Settings from the menu. Select the Email tab. Make sure the correct account is highlighted, then choose Change. Choose More Settings > Advanced > Add. Type the shared email address, such as info@thrivepass.com">info@thrivepass.com. Choose OK > OK. Choose Next > Finish > Close. Restart Outlook to Apply Changes.