php – .ics邀请日历不工作在outlook.com问题

嗨,我使用cakePHP电子邮件发送附有.ics日历的电子邮件,问题是确定按钮si显示在雅虎和Gmail完全,但不在outlook.com.
这里是一个.ics文件的例子：

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//T//T//EN
METHOD:requEST
BEGIN:VEVENT
UID:20150830T184133-19847-domain.com
DTSTAMP:20150830T184133
DTSTART:20150812T000000Z
DTEND:20150818T000000Z
ORGANIZER;CN=myTeam:MAILTO:admin@myTeam.org
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=brabrick@hotmail.com:MAILTO:brabrick@hotmail.com
LOCATION:new york
SUMMary:Madrid
BEGIN:VALARM
trigGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:reminder
END:VALARM
END:VEVENT
END:VCALENDAR

这里是我的PHP代码,创建appointement .ics文件：

$vcal = "BEGIN:VCALENDAR\r\n";
                $vcal .= "VERSION:2.0\r\n";
                $vcal .= "PRODID:-//T//T//EN\r\n";
                $vcal .= "METHOD:requEST\r\n";
                $vcal .= "BEGIN:VEVENT\r\n";


                $vcal .= "UID:".date('ymd').'T'.date('His')."-".rand()."-domain.com\r\n";
                $vcal .= "DTSTAMP:".date('ymd').'T'.date('His')."\r\n";
                $vcal .= "DTSTART:$visitedate\r\n";
                $vcal .= "DTEND:$visitedate\r\n";             
                $vcal       .=  "ORGANIZER;CN=myTeam:MAILTO:admin@myTeam.org\r\n";//j'ai ajouté CETte ligne
                $vcal       .= "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=$mail[$iduser]:MAILTO:$mail[$iduser]\r\n";
                //$vcal .= "DTEND:$end\r\n";
                if ($loc != "") $vcal .= "LOCATION:$loc\r\n";
                $vcal .= "SUMMary:$objet\r\n";
                $vcal .= "BEGIN:VALARM\r\n";
                $vcal .= "trigGER:-PT15M\r\n";
                $vcal .= "ACTION:DISPLAY\r\n";
                $vcal .= "DESCRIPTION:reminder\r\n";
                $vcal .= "END:VALARM\r\n";
                $vcal .= "END:VEVENT\r\n";
                $vcal .= "END:VCALENDAR\r\n";


                $headers = "\r\nMIME-version: 1.0\r\nContent-Type: text/calendar; method=requEST; charset=\"iso-8859-1\"";
                $headers .= "\r\nContent-Disposition: attachment; filename=\"appointment.ics\"";
                $headers .= "\r\nContent-transfer-encoding: 7bit\r\nX-Mailer: Microsoft Office Outlook 12.0";


                $Email = new CakeEmail('smtp');
                $Email->to($mail);
                $Email->subject($objet);
                $Email->replyTo('admin@myTeam.org');
                $Email->from ('admin@myTeam.org');
                $Email->setHeaders(array($headers));

提前致谢