Office 365 API v1.0, existe alguma alternativa?

$data_string = json_decode(json_encode('{
  "SaveToSentItems": "false",
  "Message": {
    "Subject": "'.$_POST['subject'].'",
    "Importance": "High",
    "Body": {
      "ContentType": "HTML",
      "Content": "'.addslashes($_POST['message']).'"
    },
    "ToRecipients": [
      {
        "EmailAddress": {
          "Name":"'.$_POST['displayName'].'",
          "Address": "'.$_POST['mail'].'"
        }
      }
    ]
  }
}'),TRUE);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://outlook.office365.com/api/v1.0/me/sendmail");
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, $_POST['auth']);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_HEADER  , true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json'
    )
);
$result = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);