Answer and explanation is below. Answer is D: The New-Mailbox –Name 'Test User' –Alias 'testuser' –UserPricipalName '[email protected]' –SamAccountName 'testuser' is the correct command to create a ...
They would have to all have the "Send As" permission and you cannot make it the default action when composing an email. They would have to choose to Send As the shared mailbox each time they compose a ...
Did you unblock the PF Mailboxes from serving hierarchy? You shouldn't have to set a default PF MBX for users to make it work. ..and yeah the default PF DB is only for when you still have 2007 or 2010 ...