Question about Outlook Express

When people send me an email to *****@hotmail.com they get the message
This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.
 
****@outlook.com

-----------------------
I have always been using hotmail.com so I dont understand why they get a message that the outlook.com is failing.
I do however receive the original email.
 
I tried sending myself an email to both the hotmail and outlook adress and both times I got the message shown above. So everyone who sends me emails does get the delivery status notification stating that it failed. I do however receive all the emails (as far as I can tell)
 
 
Message source:
 

x-store-info:D6taffyBScEUZsL+ZXbbDoZx0yi5SZysVDCEO1cb97YAgfcKYgytYV+ZHI0NBlCXZfug02cEQ+XK93fB/Fu/KXuYu0MZbO8Mc1Iw7aGPZGE2sHoNA8XTVPtdrjmlxzzU0jQdLHggWEA=
Authentication-Results: hotmail.com; spf=none smtp.helo=col0-omc4-s6.col0.hotmail.com; dkim=none header.d=mail.hotmail.com; x-hmca=none header.id=*** Email address is removed for privacy ***
X-SID-PRA: *** Email address is removed for privacy ***
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Delivery: Vj0xLjE7RD0wO0dEPTA7U0NMPTk7bD0x
X-Message-Info: AuEzbeVr9u5fkDpn2vR5iCu5wb6HBeY4iruBjnutBzpStnUabbM/X3OHG1tkHI7a3kMiU15mwZkdItk0fkPUd26iJME4hbgAI/g6pso0Zyh7O0XVOq5g8hCf8Efy9J5lqUsPh7BGuOg=
Received: from col0-omc4-s6.col0.hotmail.com ([65.55.34.208]) by SNT0-MC4-F18.Snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
	 Sun, 18 Aug 2013 23:03:25 -0700
From: *** Email address is removed for privacy ***
To: *****@hotmail.com
Date: Sun, 18 Aug 2013 23:03:24 -0700
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="9B095B5ADSN=_01CE8E7A82CBD9B80011C95Fcol0?omc4?s6.col"
X-DSNContext: 7ce717b1 - 1196 - 00000002 - 00000000
Message-ID: <*** Email address is removed for privacy ***>
Subject: Delivery Status Notification (Failure)
Return-Path: <>
X-OriginalArrivalTime: 19 Aug 2013 06:03:25.0107 (UTC) FILETIME=[D109C830:01CE9CA1]
This is a MIME-formatted message.
Portions of this message may be unreadable without a MIME-capable mail program.
--9B095B5ADSN=_01CE8E7A82CBD9B80011C95Fcol0?omc4?s6.col
Content-Type: text/plain; charset=unicode-1-1-utf-7
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
       *****@outlook.com
--9B095B5ADSN=_01CE8E7A82CBD9B80011C95Fcol0?omc4?s6.col
Content-Type: message/delivery-status
Reporting-MTA: dns;col0-omc4-s6.col0.hotmail.com
Received-From-MTA: dns;COL0-MC1-F8.Col0.hotmail.com
Arrival-Date: Sun, 18 Aug 2013 23:03:24 -0700
Final-Recipient: rfc822;*****@outlook.com
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 Requested action not taken: mailbox unavailable
--9B095B5ADSN=_01CE8E7A82CBD9B80011C95Fcol0?omc4?s6.col
Content-Type: message/rfc822
Received: from COL0-MC1-F8.Col0.hotmail.com ([65.55.34.199]) by col0-omc4-s6.col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675);
	 Sun, 18 Aug 2013 23:03:24 -0700
Resent-Message-ID: <*** Email address is removed for privacy ***>
Resent-To: *****@outlook.com
Resent-Date: Sun, 18 Aug 2013 23:03:24 -0700
Resent-From: *****@hotmail.com
X-HM-Routing-Path:Juztz0dW/V7MmsubBm6x/tolLj/kMvfnc4Vgj8XaAvoe/T9owgJAmjCxTvfVFQDam36ThvgD8XBmpzoqLce9v0dukl5hGlpgDI4LO4hc29vKSqSPisW0iC6GLOq1VFxtphBhkKQQhmr2sPjTX69f4y+n3j6sphMU
Received: from dub0-omc4-s13.dub0.hotmail.com ([157.55.2.88]) by COL0-MC1-F8.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
	 Sun, 18 Aug 2013 23:03:21 -0700
Received: from DUB115-W31 ([157.55.2.73]) by dub0-omc4-s13.dub0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675);
	 Sun, 18 Aug 2013 23:02:59 -0700
X-TMN: [Y0y+RCbt6+Pl7L1PNJQ9xnoEC7+KZc34]
X-Originating-Email: [******@hotmail.com]
Message-ID: <*** Email address is removed for privacy ***>
Return-Path: ******@hotmail.com
Content-Type: multipart/alternative;
	boundary="_8349d838-6a09-4f96-8af1-a6bf642dec0d_"
From: ***** <*****@hotmail.com>
To: ***** <***** @hotmail.com>
Subject: test
Date: Mon, 19 Aug 2013 08:02:58 +0200
Importance: Normal
MIME-Version: 1.0
X-OriginalArrivalTime: 19 Aug 2013 06:02:59.0111 (UTC) FILETIME=[C18B1B70:01CE9CA1]
--_8349d838-6a09-4f96-8af1-a6bf642dec0d_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
st 		 	   		  =
--_8349d838-6a09-4f96-8af1-a6bf642dec0d_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<style><!--
.hmmessage P
{
margin:0px=3B
padding:0px
}
body.hmmessage
{
font-size: 12pt=3B
font-family:Calibri
}
--></style></head>
<body class=3D'hmmessage'><div dir=3D'ltr'>st 		 	   		  </div></body>
</html>=
--_8349d838-6a09-4f96-8af1-a6bf642dec0d_--
--9B095B5ADSN=_01CE8E7A82CBD9B80011C95Fcol0?omc4?s6.col--