Exchange Public Folder Query Using VB.NET

Hello,

I have a problem that I have been trying to resolve for a bit but cannot seem to find any good source examples or reasons why I keep getting an error with the code below.  The code is simply to query the Public Folders of an Exchange server for a specific folder and get its size in order to assign the size value to the text of the label on the form.  So far I am constantly getting a Forbidden error also shown below.  The credentials I am passing are of an account that has basically 'god' access to Exchange just so I can be sure the permissions are not the issue.

My final goal is not only to be able to get this working correctly, but to also remove the need to pass a username and password and to rather have the credentials of the identity used running the website.

Thanks in Advance.

### Start Code
Imports System.Net
Imports System.Web
Imports System.IO


Partial Class applications_user_testpf
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        ' Variables.
        Dim Request As System.Net.HttpWebRequest
        Dim Response As System.Net.HttpWebResponse
        Dim MyCredentialCache As System.Net.CredentialCache
        Dim strPassword As String
        Dim strDomain As String
        Dim strUserName As String
        Dim strSrcURI As String
        Dim strBody As String
        Dim bytes() As Byte
        Dim RequestStream As System.IO.Stream
        Dim ResponseStream As System.IO.Stream
        Dim ResponseXmlDoc As System.Xml.XmlDocument
        Dim DisplayNameNodes As System.Xml.XmlNodeList

        ' Initialize variables.
        strUserName = "account"
        strPassword = "password"
        strDomain = "corp"
        strSrcURI = "http://server/Exadmin/admin/org/PUBLIC%20FOLDERS/Test"

        ' Build the PROPFIND request body.
        strBody = "<?xml version=""1.0"" ?><D:propfind xmlns:D=""DAV:"" xmlns:E=""http://schemas.microsoft.com/mapi/proptag/""><D:prop><E:x0e080014 /></D:prop></D:propfind>"

        ' Create a new CredentialCache object and fill it with the network
        ' credentials required to access the server.
        MyCredentialCache = New System.Net.CredentialCache
        MyCredentialCache.Add(New System.Uri(strSrcURI), "NTLM", New System.Net.NetworkCredential(strUserName, strPassword, strDomain))

        ' Create the PUT HttpWebRequest object.
        Request = CType(System.Net.WebRequest.Create(strSrcURI),  _
        System.Net.HttpWebRequest)

        ' Add the network credentials to the request.
        Request.Credentials = MyCredentialCache

        ' Specify the PROPFIND method.
        Request.Method = "PROPFIND"

        ' Encode the body using UTF-8.
        bytes = System.Text.Encoding.UTF8.GetBytes(strBody)

        ' Set the content header length.  This must be
        ' done before writing data to the request stream.
        Request.ContentLength = bytes.Length

        ' Get a reference to the request stream.
        RequestStream = Request.GetRequestStream()

        ' Write the message body to the request stream.
        RequestStream.Write(bytes, 0, bytes.Length)

        ' Close the Stream object to release the connection
        ' for further use.
        RequestStream.Close()

        ' Set the Content Type header.
        Request.ContentType = "text/xml"

        ' Set the Depth header.
        Request.Headers.Add("Depth", "0")

        ' Set the Translate header.
        Request.Headers.Add("Translate", "F")

        ' Send the PROPFIND method request and get the
        ' response from the server.
        Response = CType(Request.GetResponse(), System.Net.HttpWebResponse)

        ' Get the XML response stream.
        ResponseStream = Response.GetResponseStream()

        ' Create the XmlDocument object from the XML response stream.
        ResponseXmlDoc = New System.Xml.XmlDocument
        ResponseXmlDoc.Load(ResponseStream)

        ' Build a list of the DAV:href XML nodes, corresponding to the folders
        ' in the mailbox.  The DAV: namespace is typically assgigned the a:
        ' prefix in the XML response body.
        DisplayNameNodes = ResponseXmlDoc.GetElementsByTagName("E:x0e080014")

        ' Display the item's display name.
        Label1.Text = DisplayNameNodes(0).InnerText

        ' Clean up.
        ResponseStream.Close()
        Response.Close()

    End Sub

End Class
### End Code

### Error Received
The remote server returned an error: (403) Forbidden.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Net.WebException: The remote server returned an error: (403) Forbidden.

Source Error:


Line 76:         ' Send the PROPFIND method request and get the
Line 77:         ' response from the server.
Line 78:         Response = CType(Request.GetResponse(), System.Net.HttpWebResponse)
Line 79:
Line 80:         '
### End Error