For any organisation making use of a large number of shared mailboxes this is a bit of a pain as IT needs to both write documentation so users can do this themselves and in many cases do it for the user. As it’s an extra attribute added at the same time as the permissions, you need to remove and re-add the permissions via the normal way (EMC or Powershell’s Remove-Mailbox Permission/Add-Mailbox Permission) to make this take effect, or do it yourself via ADSI scripting/AD Powershell (probably not very supported! Demonstration Just to give you a quick demo of how simple this is, all you need to do is add permissions on the Shared Mailbox in the normal way: Then on the client, close and open Outlook.

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