The Url property on the ExchangeService object must be set.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using Microsoft.Exchange.WebServices.Data;

namespace ReadMailFromExchangeServer

{

public partial class Form1 : Form

{

ExchangeService exchange = null;

public Form1()

{

InitializeComponent();

lstMsg.Clear();

lstMsg.View = View.Details;

lstMsg.Columns.Add("Date", 150);

lstMsg.Columns.Add("From", 250);

lstMsg.Columns.Add("Subject", 400);

lstMsg.Columns.Add("Has Attachment", 50);

lstMsg.Columns.Add("Id", 100);

lstMsg.FullRowSelect = true;

}

public void ConnectToExchangeServer()

{

lblMsg.Text = "Connecting to Exchange Server..";

lblMsg.Refresh();

try

{

exchange = new ExchangeService(ExchangeVersion.Exchange2013);

exchange.Credentials = new WebCredentials("[email protected]", "Gani@love", "AutodiscoverUrl");

exchange.AutodiscoverUrl("[email protected]");

lblMsg.Text = "Connected to Exchange Server : " + exchange.Url.Host;

lblMsg.Refresh();

}

catch (Exception ex)

{

lblMsg.Text = "Error Connecting to Exchange Server!!" + ex.Message;

lblMsg.Refresh();

}

}

private void button1_Click(object sender, EventArgs e)

{

ConnectToExchangeServer();

TimeSpan ts = new TimeSpan(0, -1, 0, 0);

DateTime date = DateTime.Now.Add(ts);

SearchFilter.IsGreaterThanOrEqualTo filter = new SearchFilter.IsGreaterThanOrEqualTo(ItemSchema.DateTimeReceived, date);

if (exchange != null)

{

FindItemsResults findResults = exchange.FindItems(WellKnownFolderName.Inbox, filter, new ItemView(50));

foreach (Item item in findResults)

{

EmailMessage message = EmailMessage.Bind(exchange, item.Id);

ListViewItem listitem = new ListViewItem(new[]

{

message.DateTimeReceived.ToString(), message.From.Name.ToString() + "(" + message.From.Address.ToString() + ")", message.Subject, ((message.HasAttachments) ? "Yes" : "No"), message.Id.ToString()

});

lstMsg.Items.Add(listitem);

}

if (findResults.Items.Count <= 0)

{

lstMsg.Items.Add("No Messages found!!");

}

}

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void btnLoad_Click(object sender, EventArgs e)

{

if (exchange != null)

{

if (lstMsg.Items.Count > 0)

{

ListViewItem item = lstMsg.SelectedItems[0];

if (item != null)

{

string msgid = item.SubItems[4].Text.ToString();

EmailMessage message = EmailMessage.Bind(exchange, new ItemId(msgid));

if (message.HasAttachments && message.Attachments[0] is FileAttachment)

{

FileAttachment fileAttachment = message.Attachments[0] as FileAttachment;

//Change the below Path

fileAttachment.Load(@"C:\\Users\\Admin\\Documents\\Visual Studio 2012\\Projects\\ReadMailFromExchangeServer\\ReadMailFromExchangeServer\\Attachments\\" + fileAttachment.Name);

lblAttach.Text = "Attachment Downloaded : " + fileAttachment.Name;

}

else

{

MessageBox.Show("No Attachments found!!");

}

}

else

{

MessageBox.Show("Please select a Message!!");

}

}

else

{

MessageBox.Show("Messages not loaded!!");

}

}

else

{

MessageBox.Show("Not Connected to Mail Server!!");

}

}

}

}