After installing KB3093594 in December 2015, I am no longer able to see the full message headers in the Windows Live Mail 2012 client on Windows 7.  Hitting crtl-f3, or going to Properties...Details...Message Source only shows brief headers.  When I forward the email as an attachment, only the brief headers are shown.  My version shows as: Version 2012 (Build 16.4.3563.0918)

The headers now show like this:

From: <*** Email address is removed for privacy ***>
To: <*** Email address is removed for privacy ***>
Subject: RonicaMorgania KKeep oone's shirt oon annd try to deide hhow to treat erectle dysfuunction.
Date: Tue, 15 Dec 2015 08:02:01 -0800
MIME-Version: 1.0
Content-Type: text/html;
charset="UTF-8"
Content-Transfer-Encoding: base64
X-MIMEOLE: Produced By Microsoft MimeOLE V16.4.3563.918

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If I view the headers in Outlook.com (web), I see this, which is what I want:

x-store-info:4r51+eLowCe79NzwdU2kR3P+ctWZsO+J

Authentication-Results: hotmail.com; spf=none (sender IP is 176.117.53.43) *** Email address is removed for privacy ***; dkim=none header.d=azgoldengirl.com; x-hmca=none *** 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-Status: n:n
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Message-Info: 11chDOWqoTmWdZVOKAhr9KsMlHHY7BSFjB679nhk0ANI+GzEzsuabgKJcI4XD2AEQnaND7AuVIkXwowv26TltlscBAezxOFB9vXtABufV9o6yx+Rbuet5euxtSWEgsw5413zVLfIxDpXgzEnN4G1NiBCj7T7BGRfFSbZf5yVDK9M55ivPaZCZzy/c88cA3zplNIkRvP2R1RSPMzyalToHZe5Geb6QZ4u8KhOEftP9kw=
Received: from spamexperts.com ([176.117.53.43]) by BLU004-MC1F17.hotmail.com with Microsoft SMTPSVC(7.5.7601.23143);
	 Tue, 15 Dec 2015 08:02:00 -0800
Received: by mx.spamexperts.com (Postfix, from uid 1)
        id 157AD6D145B; Tue, Dec 15 2015 15:45:08 +0000 (UTC)
To: *** Email address is removed for privacy ***
From: *** Email address is removed for privacy ***
Subject: RonicaMorgania KKeep oone's shirt oon annd try to deide hhow to treat erectle dysfuunction.
MIME-Version: 1.0
Message-Id: <*** Email address is removed for privacy ***>
Content-Type: multipart/alternative; boundary="59F954E3F69-403504489"
Date: Tue, Dec 15 2015 15:45:08 +0000 (UTC)
Return-Path: *** Email address is removed for privacy ***
X-OriginalArrivalTime: 15 Dec 2015 16:02:00.0790 (UTC) FILETIME=[EEC01760:01D13751]

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Again, this only started after applying that KB update.