One of our Users has the problem that some of his mails have missing sender names. It is not a problem of our addressbook or the users contacts, because in the emails preview pane the senders name is visible.
The name is missing in outlook and owa. We have a Exchange 2010 and the user tried Outlook 2010 and 2016. In both of them the same Problem.
Does anyone know that Problem or has a solution?