http://www.dld.go.th/ict/article/tip/tip07.html
http://www.vcharkarn.com/vblog/37250/32

<?php
error_reporting(0);

$opts = array(
'http'=>array(
'method'=>"GET",
'header'=>"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n"
)
);

$context = stream_context_create($opts);

$url = "http://messenger.services.live.com/users/user@apps.messenger.live.com/presence?mkt=th-TH&cb=Microsoft_Live_Messenger_PresenceButton_onPresence";
$x = file_get_contents($url, false, $context);
echo $x;
$x1 = explode("displayName",$x);
//echo $x1[0];
$x2 = explode('"status"',$x1[0]);
//echo $x2[1];
$x3 = explode('"',$x2[1]);
//echo $x3[1];
$msnstatus = $x3[1];
unset($x1);unset($x2);unset($x4);

if($msnstatus != "Offline"){
echo '<a target="_blank" href="http://settings.messenger.live.com/Conversation/IMMe.aspx?invitee=user@apps.messenger.live.com&mkt=en-US">
<img src=img/msn.gif></a></img>';
}else{
echo '<img src=img/msn1.gif></img>';
}