How to download unread email attachment using Exchange web service in ASP.NET

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C#

ASP.NET

server

Outlook

, +

I am using Exchange Server 2007 SP3

and I am able to connect exchange web service using following code

ExchangeServiceBinding esb = new ExchangeServiceBinding();
esb.RequestServerVersionValue = new RequestServerVersion();
esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1;
esb.Credentials = new NetworkCredential("<user_id>", "<password>", "<domain>");
esb.Url = @"https://<server_fqdn>/ews/Exchange.asmx";</server_fqdn></domain></password></user_id>

I am looking for code to download unread attachment.

Could you please help me?