Open and use a shared mailbox in Outlook on the web
support.microsoft.com › en-us › officeOutlook on the web. A shared mailbox makes it easy for a group of people to monitor and send email from a public email address, like info@contoso.com. When a person in the group replies to a message sent to the shared mailbox, the reply appears to come from the shared address, not from the individual person. You can also use the shared mailbox as a shared team calendar.