Unable to Read Emails in Outlook

namespace EmailRead
{
class Program
{
static void Main(string[] args)
{
ReadMailItems();
}
private static void ReadMailItems()
{
Application outlookApplication = null;
NameSpace outlookNamespace = null;
MAPIFolder inboxFolder = null;
const string destinationDirectory = @"C:\TestFileSave";
if (!Directory.Exists(destinationDirectory))
{
Directory.CreateDirectory(destinationDirectory);
}
int emailCounter = 0;
try
{
outlookApplication = new Application();
outlookNamespace = outlookApplication.GetNamespace("MAPI");
inboxFolder = outlookApplication.ActiveExplorer().Session.GetDefaultFolder(OlDefaultFolders.olFolderInbox).Folders["Birthday Emails"];
foreach (MailItem item in inboxFolder.Items)
{
if (item.UnRead)
{
string fromEmailAddress = item.SenderEmailAddress.ToString();

emailCounter++;
var stringBuilder = new StringBuilder();
stringBuilder.AppendLine("From: " + item.SenderEmailAddress.ToString());
stringBuilder.AppendLine("To: " + item.To);
stringBuilder.AppendLine("CC: " + item.CC);
stringBuilder.AppendLine("");
stringBuilder.AppendLine("Subject: " + item.Subject);
stringBuilder.AppendLine(item.Body);
Attachments attachments = item.Attachments;
MailItem newEmail = item as MailItem;
if (newEmail == null) continue;
if (newEmail.Attachments.Count > 0)
{
for (int i = 1; i <= newEmail.Attachments.Count; i++)
{
string fileName = newEmail.Attachments[i].FileName.ToLower();
if (!fileName.Contains(".png") && !fileName.Contains(".jpg") && !fileName.Contains(".jpeg"))
{
string filePath = Path.Combine(destinationDirectory, newEmail.Attachments[i].FileName);
newEmail.Attachments[i].SaveAsFile(filePath);
Console.WriteLine(stringBuilder.ToString());
}
}
}

item.UnRead = false;
}
Marshal.ReleaseComObject(item);
}
}
catch (System.Exception ex)
{
throw ex;
}
finally
{
ReleaseComObject(inboxFolder);
ReleaseComObject(outlookNamespace);
ReleaseComObject(outlookApplication);
}
}
private static void ReleaseComObject(object obj)
{
if (obj != null)
{
Marshal.ReleaseComObject(obj);
obj = null;
}
}

}
}