Set restriction to get messages older than a specific date using EWS?

Question

Hi, I'm new working with EWS and I have found some code to set a restriction to help me filter messages "between" to dates, but I need to be able to obtain emails that are "older" than a specific date so I can delete them.  My application needs to be
able to clean up a mailbox to only to keep up to so many days/weeks worth of emails.  The code I have to search for emails that works
between dates is:
public void SetDateRestriction(FindItemType findItemRequest)
DateTime dateStart = DateTime.Now;
DateTime dateEnd = DateTime.Today.AddDays(-180);
PathToUnindexedFieldType dateSentPath = new PathToUnindexedFieldType();
dateSentPath.FieldURI = UnindexedFieldURIType.itemDateTimeSent;
IsGreaterThanOrEqualToType isGreaterThanOrEqual = new IsGreaterThanOrEqualToType();
isGreaterThanOrEqual.Item = dateSentPath;
FieldURIOrConstantType dateConstant = new FieldURIOrConstantType();
ConstantValueType dateConstantValue = new ConstantValueType();
//dateConstantValue.Value = string.Format("{0}-{1}-{2}T00:00:00Z", dateStart.Year.ToString(), dateStart.Month.ToString(), dateStart.Day.ToString());
dateConstantValue.Value = dateStart.ToUniversalTime().ToString("yyyy-MM-ddT00:00:00Z");
dateConstant.Item = dateConstantValue;
isGreaterThanOrEqual.FieldURIOrConstant = dateConstant;
// less than or equal to
PathToUnindexedFieldType dateSentPath1 = new PathToUnindexedFieldType();
dateSentPath1.FieldURI = UnindexedFieldURIType.itemDateTimeSent;
IsLessThanOrEqualToType lessThanOrEqualTo = new IsLessThanOrEqualToType();
lessThanOrEqualTo.Item = dateSentPath1;
FieldURIOrConstantType dateConstant1 = new FieldURIOrConstantType();
ConstantValueType dateConstantValue1 = new ConstantValueType();
//dateConstantValue1.Value = string.Format("{0}-{1}-{2}T00:00:00Z", dateEnd.Year.ToString(), dateEnd.Month.ToString(), dateEnd.Day.ToString());
dateConstantValue1.Value = dateEnd.ToUniversalTime().ToString("yyyy-MM-ddT00:00:00Z");
dateConstant1.Item = dateConstantValue1;
lessThanOrEqualTo.FieldURIOrConstant = dateConstant1;
RestrictionType restriction = new RestrictionType();
AndType andType = new AndType();
andType.Items = new SearchExpressionType[] { lessThanOrEqualTo , isGreaterThanOrEqual };
restriction.Item = andType;
findItemRequest.Restriction = restriction;
How can I modify this to give me emails older than a specific date?  Also any input on doing the deleting would also be greatly appreciated!
Best Regards,
Nelson

Answer 1

Thank you very much Glen!  I can't believe it was that easy.  Works perfect.  I will work on the DeleteItemType.  I was also wondering if there was a way to detect if an email is an Out-of-Office (OOO) or Undeliverable message? 
My app goes through all the emails and I need to skip any that are OOO or Undeliverable messages.  I've learned how to use the SearchFilter and I find that easier and more straight forward than setting the restrictions.  I'm also able to use a SearchFilter
to get emails older than the specified date. 
Here's my new code for reading unread emails using the SearchFilter and paging (for better efficiency). 
1 - Is there anyway to tell the filter to get AllProperties without having to specify each one using ItemSchema or EmailMessageSchema?
2- What is the difference between those two (any advantages over one or the other)?
3 -Is there any reason to even be using the ExchangeServiceBinding here anymore since it seems the ExchangeService object is all I need?  In my old code, I was using the ExchangeService object to do an AutoDiscover and then using that to set the URL
in the ExchangeServiceBinding.  What are the main to difference/uses for these to objects?  Sorry if that's a dumb question.
private void GetUnReadEmails(string sMailboxName)
// Create the binding to Exchange
ExchangeServiceBinding esb = new ExchangeServiceBinding();
esb.RequestServerVersionValue = new RequestServerVersion();
//Console.WriteLine("Exchange version: " + esb.RequestServerVersionValue.Version);
//esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1;
ExchangeService service = GetBinding(sMailboxName);
Console.WriteLine("Exchange version: " + service.RequestedServerVersion);
esb.Url = service.Url.ToString();
esb.Credentials = new NetworkCredential(Username, Password, Domain);
Mailbox mb = new Mailbox(sMailboxName);
FolderId fid1 = new FolderId(WellKnownFolderName.Inbox, mb); // where fid1 was WellKnownFolderName.Inbox
//FindFoldersResults findResults = service.FindFolders(fid1, new FolderView(int.MaxValue));
ItemView iv = new ItemView(50, 0);
FindItemsResults<Item> findResults = null;
PropertySet ivPropSet = new PropertySet(BasePropertySet.IdOnly);
//SearchFilter ivSearchFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false), new SearchFilter.ContainsSubString(ItemSchema.Subject,"MSGID:"));
SearchFilter searchFilter = new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false);
iv.PropertySet = ivPropSet;
do
findResults = service.FindItems(fid1, searchFilter, iv);
string sText = "";
if(findResults.Items.Count > 0)
//PropertySet itItemPropSet = new PropertySet(BasePropertySet.IdOnly) { EmailMessageSchema.Body };
PropertySet itemPropSet = new PropertySet(BasePropertySet.IdOnly) {ItemSchema.Subject, ItemSchema.Body, ItemSchema.DateTimeReceived, ItemSchema.HasAttachments, ItemSchema.ItemClass};
itemPropSet.RequestedBodyType = BodyType.Text;
service.LoadPropertiesForItems(findResults.Items, itemPropSet);
//service.LoadPropertiesForItems(findResults.Items, itItemPropSet);
//service.LoadPropertiesForItems(findResults, new PropertySet(ItemSchema.Subject, ItemSchema.Body, ItemSchema.DateTimeReceived));
Console.WriteLine("Total items: " + findResults.TotalCount);
foreach (Item item in findResults.Items)
Console.WriteLine("ItemID: " + item.Id.UniqueId);
Console.WriteLine("Subject: " + item.Subject);
Console.WriteLine("Received date: " + item.DateTimeReceived);
Console.WriteLine("Body: " + item.Body);
Console.WriteLine("Has attachments: " + item.HasAttachments);
//Mark the email as read
EmailMessage emEmail = EmailMessage.Bind(service, item.Id);
//emEmail.Load();
emEmail.IsRead = true;
emEmail.Update(ConflictResolutionMode.AlwaysOverwrite);
sText += "Subject: " + (item.Subject.Trim()) + " ";
//sText += "DisplayTo: " + (item.DisplayTo.Trim()) + " ";
sText += "DateTimeReceived: " + (item.DateTimeReceived.ToString()) + " ";
sText += "ItemClass: " + (item.ItemClass.Trim()) + " ";
sText += "\r\n";
else
sText = "No unread emails";
Console.WriteLine("No unread emails");
txtItems.Text = sText;
iv.Offset += findResults.Items.Count;
} while (findResults.MoreAvailable == true);
Thanks again for your time.  I appreciate it.
Nelson