Reasons such as mergers and acquisitions, rebranding, and compliance could force organizations to move their contents to another Office 365/ Microsoft 365 subscription. Consequently, they have different attributes, particularly in terms of user-roles when compared to regular mailboxes.
These shared email accounts are typically created and managed by admins, unlike regular mailboxes that are managed by individual users.
Organizations use shared mailboxes to enable multiple users to read and reply to emails from an address that is common to a team.
Reviewer rights are recommended at the Mailbox level.