Offices and courses often have at least one shared mailbox for voice mail, responding to inquiries, projects, and more. Follow the steps below to open a shared mailbox in Outlook Online (Webmail).
NOTE: To open a shared mailbox in Outlook Desktop, see similar articles here.
Sign in as yourself, including Duo MFA.
Once signed in, select user icon, top-right and choose "Open another mailbox..."
Search for the shared mailbox email address, i.e. firstname.lastname@example.org or email@example.com
Select the mailbox from the list and choose "Open"
The mailbox will open in a new tab, which can be bookmarked for easy access.