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I need to make some mailboxes available to more than one user.
As a test, I've added myself to another users mailbox's permission list using the management shell:
add-mailboxpermission -Identity 'shared@example.com' -User 'me@exmaple.com' -AccessRights FullAccess
The mailbox then automatically shows up in my folder list because it is automapping. I can browse the full hierarchy, but contents are not visible.
When I connect to OWA, I can connect to the other mailbox as my user, and view it as if I were logged in as them.
If I add myself via Outlooks GUI ( I can modify permissions etc... ) as a "Owner", then I am able to see the contents of that particular folder. Because the permissions do not cascade from the mailbox down to the the base folders/sub folders, I'm not particularly interested in this option.
I need to apply this to several mailboxes for several different users, with an unknown number of sub folders.