public static void Run()
        {
            try
            {
                // ExStart:SaveMessagesToMemoryStream
                string datadir = RunExamples.GetDataDir_Exchange();
                // Create instance of EWSClient class by giving credentials
                IEWSClient client = EWSClient.GetEWSClient("https://outlook.office365.com/ews/exchange.asmx", "testUser", "pwd", "domain");

                // Call ListMessages method to list messages info from Inbox
                ExchangeMessageInfoCollection msgCollection = client.ListMessages(client.MailboxInfo.InboxUri);

                // Loop through the collection to get Message URI
                foreach (ExchangeMessageInfo msgInfo in msgCollection)
                {
                    string strMessageURI = msgInfo.UniqueUri;

                    // Now save the message in memory stream
                    MemoryStream stream = new MemoryStream();
                    client.SaveMessage(strMessageURI, datadir + stream);
                }
                // ExEnd:SaveMessagesToMemoryStream
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
        }
        public static void Run()
        {
            // ExStart:SaveMessagesUsingExchangeWebServices
            string dataDir = RunExamples.GetDataDir_Exchange();
            // Create instance of IEWSClient class by giving credentials
            IEWSClient client = EWSClient.GetEWSClient("https://outlook.office365.com/ews/exchange.asmx", "testUser", "pwd", "domain");

            // Call ListMessages method to list messages info from Inbox
            ExchangeMessageInfoCollection msgCollection = client.ListMessages(client.MailboxInfo.InboxUri);

            // Loop through the collection to get Message URI
            foreach (ExchangeMessageInfo msgInfo in msgCollection)
            {
                string strMessageURI = msgInfo.UniqueUri;

                // Now save the message in disk
                client.SaveMessage(strMessageURI, dataDir + msgInfo.MessageId + "out.eml");
            }
            // ExEnd:SaveMessagesUsingExchangeWebServices
        }