Using SearchFilter and other Nested Types in the EWS Managed API from Powershell

A SearchFilter in the EWS Managed API gives you the ability to place restrictions on any findItem operations you do on a folder with Exchange Web Services. For instance you can search for a message in a folder based on a subject or words within the subject etc. Both the SearchFilter and Recurrence classes with the EWS Managed API are implemented as Nested Types see http://msdn.microsoft.com/en-us/library/ms229027.aspx for a description as to what these are. To use one of these objects within a NestedType you need to use the following format when initializing it namespace.enclosing type+nested type see http://weblogs.asp.net/soever/archive/2006/12/11/powershell-and-using-net-enum-types.aspx

So to declare a IsEqualTo filter use

$view = New-Object Microsoft.Exchange.WebServices.Data.ItemView(1)
$view.SearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo([Microsoft.Exchange.WebServices.Data.EmailMessageSchema]::IsRead, $false)
$findResults = $service.FindItems([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$view)

For a ContainsSubstring filter use

$view.SearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+ContainsSubstring([Microsoft.Exchange.WebServices.Data.ItemSchema]::Subject,”string to search”)

To put that in a example to search for any messages from a certain email address you could use

$searchemail = “mailtosearch@domaim.com"
$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\1.0\Microsoft.Exchange.WebServices.dll"
[void][Reflection.Assembly]::LoadFile($dllpath)
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2007_SP1)

$windowsIdentity = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$sidbind = "LDAP://<SID=" + $windowsIdentity.user.Value.ToString() + ">"
$aceuser = [ADSI]$sidbind

$service.AutodiscoverUrl($aceuser.mail.ToString())
$inbox = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($service, [Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox)
"Number or Unread Messages : " + $inbox.UnreadCount
$view = New-Object Microsoft.Exchange.WebServices.Data.ItemView(1)
$view.SearchFilter = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+ContainsSubstring ([Microsoft.Exchange.WebServices.Data.EmailMessageSchema]::Sender, searchemail)
$findResults = $service.FindItems([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$view)
""
"Last Mail From : " + $findResults.Items[0].From.Name
"Subject : " + $findResults.Items[0].Subject
"Sent : " + $findResults.Items[0].DateTimeSent