CDavExchangeCalendar::ConvertExchangeResponse

static function ConvertExchangeResponse($response)
	{
		$response = mb_strtolower($response);

		if ($response === 'accept')
		{
			return 'Y';
		}

		if ($response === 'decline')
		{
			return 'N';
		}

		return 'Q';
	}