We have multiple users that have full and send as permissions to another mailbox in our organization. All users use "Cached Exchange Mode". For some reason these users are no longer able to see new email as it arrives in the shared mailbox; but they can see mail in their own mailbox. When I delete and re-create the user's mailbox profile; the mail is seen again. Is there a way to correct this issue without having to take the user out of cached exchange mode? This is happening to users with Outlook 2010 and 2013.
Does this have something to do with Exchange 2010's throttling settings?