[Dovecot] More than one inbox possible ?

I wanted to know if more than one INBOX - entry is possible.

My situation:

Three users with user@domain One Mail-Adress office@domain, where all three users can get the mails. But i dont want to copy the mails from office to the user (like mailinglist), because if one reads a new mail it should be marked as read at all users. Same with answered and deleted.

Thanks in advance, Christian