So party A sends a meeting request to party B (Outlook 2013) and party C (Outlook 2016). Both parties receive the meeting request and the initial content in the body of the meeting request so everything is fine to this point. Then, party A will add more content to the body of the meeting request and resend. Both parties receive the update and party B will get all of the updated content but Party C will not. So party C is aware that there has been an update to the meeting contents but doesn't know what that update is.
Any ideas for troubleshooting this issue is greatly appreciated.