And a couple of deeper questions on this topic:
1. When a new folder is created, is this an atomic process whereby the return to the caller does not happen until the new folder is replicated? I suspect from this post that the replication of structure changes is asynchronous, meaning that there can be a delay before a user connected to PFMB02 (non-primary) sees a change to the structure, while a user connected to PFMB01 (primary) sees the change immediately?
2. Can you explain the folder assignment logic? For example, one can call new-publicfolder -mailbox PFMB02 to create a folder and assign a content mailbox for that folder. Does the logic remain the same as written in the article? Does ever replica of the same folder have the same metadata with regards to the content mailbox?
3. When bulk creating a new folder tree (perhaps for migration), is it better to create the structure all at once on the primary hierarchy mailbox first, then add additional mailboxes and change the content mailbox for specific folders, or the opposite - create all the content mailboxes first, then create AND set the content mailbox for folders?