How to set priority of ExchangeService's ReponseMessage

Question

I'm using Microsoft.Exchange.WebServices.Data.ExchangeService to find a particular email and Reply All to it. I know using System.Net.Mail's MailMessage, I'm able to set the Priority property. I'm not seeing the equivalent of this using ExchangeService?

var exchangeService = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
exchangeService.Credentials = new WebCredentials("usr", "pw", "myDomain.com");
exchangeService.TraceEnabled = false;
exchangeService.AutodiscoverUrl($"{usr}@myDomain.com", AutodiscoverRedirectionUrlValidationCallback);

It finds an email:

var filter = new SearchFilterCollection(LogicalOperator.And, new IsEqualTo(EmailMessageSchema.IsRead, false));
var results = exchangeService.FindItems(WellKnownFolderName.Inbox, filter, new ItemView(50));

var interesting = results.Items.FirstOrDefault(e => e.Subject == "interesting");

It creates a Reply All email:

var response = interesting.CreateReply(true);
response.Body = "I'm important!";
response.Priority = MailPriority.High; // No such property?

response.SendAndSaveCopy();

Answer 1

Before doing var response = interesting.CreateReply(true);

Set the importance of the interesting variable like so interesting.Importance = Importance.Low; NOTE: If var interesting is not an EmailMessage cast it first. It might be of type Item

When you call CreateReply() the importance will carry over into the reply.

I tested this like so

var interesting = results.Items.FirstOrDefault();
var orignal = (EmailMessage)interesting; 
orignal.Importance = Importance.Low; orignal.CreateReply(true); 
orignal.Subject = "Low priority"; 
orignal.ToRecipients.Add("[email protected]"); 
orignal.SendAndSaveCopy();

The original email was a high priority and the response was a low priority