Currently, several webAdmin APIs relies on mailboxId in their endpoints.
That is a good choice, as mailboxId is immutable and thus more predictable than mailboxPath.
However, mailboxId is not directly exposed to the end user, who can get confused.
Currently, using webadmin, I have no way of linking mailboxPath and mailboxId
Proposal is to add mailboxId as part of the MailboxResponse object.