You disable the Display sender’s name on messages option in the Exchange Management Console (EMC) on a Microsoft Exchange Server 2010 server. You do this to hide the display name of the internal sender on outgoing messages.
A user whose mailbox is hosted on the Exchange Server 2010 server sends a meeting request to an external attendee.
In this scenario, the external attendee cannot open the meeting request.
This issue occurs because the syntax in iCalendar (iCal) is incorrect. An unnecessary CN parameter is added to the organizer property and the attendee property. Also, the property values of the CN parameter are set to Null when the "Display sender’s name on messages" option is disabled.
For example, the following message is found in the iCal part in the MIME message when the "Display sender’s name on messages" is disabled: