Hey, David, thank you for the reply.
I actually inteprut this completely different, and you probablky won't like my interpretation, if it is correct, haha, as I don't particularly.
The way I understand that this will work, is to be able to utilise all features of the New Outlook app, for example the, what you would think is, simple action of pinning to favourites, then you will need to add each Shared Mailbox "as an account".
My thoughts are that, once you do this, it will appear as if it was a full licencesd mailbox.
At present, we simply add a licenced mailbox, and all Shared Mailboxes are available, without the need to do anything, which is very convenient when you have access to many Shared Mailboxes.
However, going forward, let's say I have access to 20 Shared Mailboxes. If I wanted to pin the Inbox of all of these to my favourites, then I intepret this as me having to add each of these 20 Shared Mailboxes manually, thus giving me the capability to pin to favourites 🙈.
I could be wrong, but this is how I believe they are implementing this.