远程服务器返回错误 405 方法不允许

>我正在尝试将邮件从收件箱移动到已删除的文件夹。但是当我运行该程序时，我收到上述错误消息。请帮助解决这个问题。这是我的代码

 string mailboxURI = "URL//"; 
        string username = "username";
        string password = "Password";
        string domain = "domain name";
        Console.WriteLine("Connecting to Exchange Server....");
        try
        {
            NetworkCredential credential = new NetworkCredential(username, password, domain);
            ExchangeClient client = new ExchangeClient(mailboxURI, credential);
            ExchangeMailboxInfo mailboxInfo = client.GetMailboxInfo();
            // List all messages from Inbox folder
            Console.WriteLine("Listing all messages from Inbox....");
            ExchangeMessageInfoCollection msgInfoColl = client.ListMessages(mailboxInfo.InboxUri);
            foreach (ExchangeMessageInfo msgInfo in msgInfoColl)
            {
                // Move message to "Deleted" folder, after processing certain messages
                // based on some criteria
                if (msgInfo.Date != DateTime.Today)
                {
                    // Move it
                    client.MoveItems(msgInfo.UniqueUri, client.MailboxInfo.RootUri + "/Deleted/" + msgInfo.Subject);
                    Console.WriteLine("Message moved...." + msgInfo.Subject);
                }
                else
                {
                    Console.WriteLine("Not moved:" + msgInfo.Subject);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error:"+ex.Message);
            Console.Read();
        }
    }