Why OE did not see attachments?

I received email in an Hotmail account. When I popped the message into OE,
the entire message was indeed pulled into OE, but OE did not recognize the
attachments as such, making it appear that the message had no attachments.

(But OE displayed only the original body the message. It did not show the
attachments in their ASCII form either.)

Yet when I tried to isolate the problem by sending a message to my Hotmail
account, attaching exactly the same (binary) files, then popping the message
into OE, OE had no problem recognizing the attachments and indicating their
presence.

Can anyone explain this?

I have included relevant excerpts from both messages. See below. The
entire messages are too long to include here -- about 5.2 Mbytes each.

I do not see any material difference.

I am using OE 6.00.2900.5512(xpsp.080413-2105), MS Win XP SP3 with IE
6.0.2900.5512.xpsp_sp3_gdr.080814-1236.


----- original email (OE fails to show attachments) -----

X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MDtTQ0w9MA==
X-Message-Status: n:0
X-SID-PRA: Xxxx Xxxx
X-AUTH-Result: NONE
X-Message-Info:
JGTYoYF78jEHjJx36Oi8+Z3TmmkSEdPt3Mi6GgUSv7xMmWBCXF 8dIISeYkWGsK2kGlnxqnO2dgtMSRKAUx6Dw9/NFtfRpscj
Received: from qmta01.emeryville.ca.mail.comcast.net ([76.96.30.16]) by
bay0-mc2-f28.Bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959);
Fri, 9 Apr 2010 14:44:28 -0700
Received: from omta16.emeryville.ca.mail.comcast.net ([76.96.30.72])
by qmta01.emeryville.ca.mail.comcast.net with comcast
id 3Zgf1e00A1ZMdJ4A1ZkVbx; Fri, 09 Apr 2010 21:44:29 +0000
Received: from DadsComputer ([xxx.xxx.xxx.xxx])
by omta16.emeryville.ca.mail.comcast.net with comcast
id 3Zoy1e00F4nPT5f8cZp69D; Fri, 09 Apr 2010 21:49:38 +0000
From: "Xxxx Xxxx"
To: "'Yyyy Yyyy'"
References:

In-Reply-To:
Subject: Rounding a formula in code
Date: Fri, 9 Apr 2010 14:43:30 -0700
Message-ID: 000301cad82d$b8e58d20$2ab0a760$@net
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0004_01CAD7F3.0C86B520"
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AcrYB6d/Uhpx3e9XSJenevaa739/9AAJBnyQ
Content-Language: en-us
X-MS-TNEF-Correlator: 0000000002F9CAB20177E243AF0FAF79E86F6C5D645A2400
Return-Path:
X-OriginalArrivalTime: 09 Apr 2010 21:44:28.0607 (UTC)
FILETIME=[D4A324F0:01CAD82D]

This is a multi-part message in MIME format.

------=_NextPart_000_0004_01CAD7F3.0C86B520
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit

[....elided....]

------=_NextPart_000_0004_01CAD7F3.0C86B520
Content-Type: application/ms-tnef;
name="winmail.dat"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="winmail.dat"

[....elided....]

[....other MIME parts elided....]

------=_NextPart_000_0004_01CAD7F3.0C86B520--




----- my test email (OE does show attachments ) -----

X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MDtTQ0w9Mg==
X-Message-Status: n:0
X-SID-PRA: Xxxx Xxxx
X-SID-Result: Pass
X-AUTH-Result: PASS
X-Message-Info:
JGTYoYF78jH0I8uVQ5hupZtHt6HplmnhMIOHnvMv6/rjRmprS3QY7fvAfoX7h+oCA0tO8kj0w/AFBtDa5nONxLfWcDL1xSPH
Received: from snt0-omc4-s25.snt0.hotmail.com ([65.55.90.228]) by
SNT0-HMMC1-F2.Snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959);
Sun, 11 Apr 2010 10:41:36 -0700
Received: from SNT116-W30 ([65.55.90.200]) by snt0-omc4-s25.snt0.hotmail.com
with Microsoft SMTPSVC(6.0.3790.3959);
Sun, 11 Apr 2010 10:41:35 -0700
Message-ID:
Return-Path:
Content-Type: multipart/mixed;
boundary="_696e1fe4-3761-4df1-b35f-1d1d6c5c154f_"
X-Originating-IP: [xxx.xxx.xxx.xxx]
From: Xxxx Xxxx
To:
Subject: all attach
Date: Sun, 11 Apr 2010 10:41:34 -0700
Importance: Normal
MIME-Version: 1.0
X-OriginalArrivalTime: 11 Apr 2010 17:41:35.0741 (UTC)
FILETIME=[3B5BC2D0:01CAD99E]

--_696e1fe4-3761-4df1-b35f-1d1d6c5c154f_
Content-Type: multipart/alternative;
boundary="_31da6742-0eab-4bc9-b262-f6ac1f80cc7a_"

--_31da6742-0eab-4bc9-b262-f6ac1f80cc7a_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

[....elided....]

--_31da6742-0eab-4bc9-b262-f6ac1f80cc7a_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

[....elided....]

--_31da6742-0eab-4bc9-b262-f6ac1f80cc7a_--

--_696e1fe4-3761-4df1-b35f-1d1d6c5c154f_
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="attach1"

[....elided....]

[....other MIME parts elided....]

--_696e1fe4-3761-4df1-b35f-1d1d6c5c154f_--