I'm trying to migrate a small company from an ancient, on-premise Linux mail server over to Exchange Online. One of their core requirements is that they need copies of all inbound and outbound e-mail to be saved in a separate mailbox called "group", where none of the messages can be deleted.
My understanding was that journaling could do this, but as I'm preparing to enable it, the documentation seems to say that you can't journal to another Exchange Online mailbox, so I'm a little puzzled as to how this works with Exchange Online.
Can someone explain how this could be done with or without journaling?