Sending email with php and Outolook 2010 not working

I kindly ask you help in order to fix it. From windows 7 I am trying to send email using Outlook 2010 with Xampp control panel version 3.2.2.

Php.ini:

[COM_DOT_NET]
extension=php_com_dotnet.dll

I also checked my registry for EnableDCOM, it is set to 'Y'

My php code is:

if (!defined("olMailItem")) {define("olMailItem",0);}
$outlook_Obj = new COM("outlook.application") or die("Outlook no start");

//just to check you are connected.
echo "Loaded MS Outlook, version {$outlook_Obj->Version}\n";
$oMsg = $outlook_Obj->CreateItem(olMailItem);
$oMsg->Recipients->Add($to);
$oMsg->Subject=$subject;
$oMsg->Body=$message;
$oMsg->Save();
$oMsg->Send();
?>

Error occur on line $oMsg->Recipients->Add($to); is Loaded MS Outlook, version 14.0.0.7172

Fatal error: Uncaught exception 'com_exception' with message 'Error [0x80004004] Operation failed. ' in C:\xampp\htdocs\index.php:25 Stack trace: #0 C:\xampp\htdocs\index.php(25): unknown() #1 {main} thrown in C:\xampp\htdocs\index.php on line 25

Please help me.