Author: admin

$usertoQuery = "EMAILADDRESS"
 
$dllpath = "XXX\Microsoft.Exchange.WebServices.dll"
[void][Reflection.Assembly]::LoadFile($dllpath)
 
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP1)
 
$service.Credentials = new-object Microsoft.Exchange.WebServices.Data.WebCredentials("LOGIN","PWD","DOMAIN")
$service.Url = new-object Uri("http://URL/EWS/Exchange.asmx");
 
$svFldid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::SearchFolders,$MailboxName)
$delFldid = [Microsoft.Exchange.WebServices.Data.DeleteMode]::HardDelete
 
$fvFolderView = new-object Microsoft.Exchange.WebServices.Data.FolderView(1000)
 
$folders = $service.findfolders($svFldid,$fvFolderView)
$ExtendedProp = new-object Microsoft.Exchange.WebServices.Data.ExtendedPropertyDefinition([Microsoft.Exchange.WebServices.Data.DefaultExtendedPropertySet]::PublicStrings, "MyCustomID", [Microsoft.Exchange.WebServices.Data.MapiPropertyType]::String)
$ExtendedProp
$Propset = new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties, $ExtendedProp)
 
foreach ($folder in $folders)
{
    if ($folder.displayName -eq "FOLDERNAME_I_WANT_TO_CHECK")
    {
		"We are in the correct folder"
         $fvItemView = new-object Microsoft.Exchange.WebServices.Data.ItemView(10000)
 
		 $items = $service.FindItems($folder.Id,$fvItemView)	
		 #Don't show any result for the next line
		 $service.LoadPropertiesForItems($items, $Propset)
		 foreach ($item in $items)
		 {
			"**Subject** : " 
			$item.Subject
			"**Number of Extended Properties**: " 
			$item.ExtendedProperties.Count		
 
			$a = 0
 
			foreach ($extendedProperty in $item.ExtendedProperties)
			{
				if ($extendedProperty.PropertyDefinition.Name -eq $ExtendedProp.Name)
				{					
					$a = 1
					"Break (Value = " + $extendedProperty.Value + ")"
					break;						
				}		
			}
 
			if ($a -eq 0)
			{			
				$g1 = [Guid]::NewGuid()
				$item.SetExtendedProperty($ExtendedProp, $g1.ToString())
				"Guid = " + $g1
				"ValueGuid added!"
				$item.Update([Microsoft.Exchange.WebServices.Data.ConflictResolutionMode]::AlwaysOverwrite)
				"Item saved"
			}
		 }	 
    }
}