How to query Exchange mail server for email items?

Question

I am trying to upgrade en existing application that reads Exchange 2003 using WebDAV. The mail server is to be upgraded to Exchange 2013, so I am checking how I can use EWS.

I have a problem in that although I know the inbox has unread items with attachments, the query I am running against the FindItems object is returning empty...

Here is my code snippet:

private static void GetAttachments(ExchangeService service)
{
    // Return a single item.
    ItemView view = new ItemView(100);
    ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;
    ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);// .Exchange2007_SP1);

    service.UseDefaultCredentials = true;
    service.AutodiscoverUrl("bbtest@bocuk.local", RedirectionUrlValidationCallback);

    ItemView view = new ItemView(1);

    string querystring = "HasAttachments:true Subject:'ATTACHMENT TEST' Kind:email";

    // Find the first email message in the Inbox that has attachments. 
    // This results in a FindItem operation call to EWS.
    FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, querystring, view);

    //FindItemsResults<Item> results = service.FindItems(WellKnownFolderName.Inbox, new ItemView(50));

    if (results.TotalCount > 0)
        {
            // looping through all the emails
            for (Int16 iDx = 0; iDx < results.TotalCount-1; iDx++)
            {

                EmailMessage email = results.Items[iDx] as EmailMessage;

                if (email.IsRead == false) { 

                    // Request all the attachments on the email message. This results in a GetItem operation call to EWS.
                    email.Load(new PropertySet(EmailMessageSchema.Attachments));

                    foreach (Attachment attachment in email.Attachments)
                    {
                        if (attachment is FileAttachment)
                        {
                            FileAttachment fileAttachment = attachment as FileAttachment;

What I am supposed to be doing is reading all the unread emails in the target inbox (only one Exchange server) and taking the attachments on disk so I can then add them as attachments as new cases on SalesForce.

Where am I going wrong?

Also, this line:

ItemView view = new ItemView(100);

was:

ItemView view = new ItemView(1);

Surely that will only look for one email item, right?

Answer 1

I submitted the following XML and got the expected results. The easiest way to figure out what is going on is to look at the XML.

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
               xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
 <soap:Header>
    <t:RequestServerVersion Version="Exchange2010_SP2"/>
  </soap:Header>
<soap:Body>
    <FindItem xmlns="http://schemas.microsoft.com/exchange/services/2006/messages"
               xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
              Traversal="Shallow">
      <ItemShape>
        <t:BaseShape>IdOnly</t:BaseShape>
      </ItemShape>
      <ParentFolderIds>
        <t:DistinguishedFolderId Id="inbox"/>
     </ParentFolderIds>
      <QueryString>HasAttachments:true Subject:'ATTACHMENT TEST' Kind:email</QueryString>
    </FindItem>
  </soap:Body>
</soap:Envelope>