Original issue of hanging/crashing is fixed.

Additionally, we can now decode the full meeting response reply 
(though it seems in at least some sample data that the ORGANIZER field 
is only present in a sort of MAPI-handle kind of property, so the 
actual email address isn't available).

At this point, this is more of a Horde_Compress issue, not IMP. Moving queue.

Exchange/Outlook is supposed to be smart enough to not send those 
types of responses to "external" SMTP addresses. At the very least, I 
believe there is a setting that can turn this off.
Well, sort of. Our TNEF de-compressor has some issues where the binary 
data is read incorrectly, I'm still working on it. It's difficult 
because MS doesn't publish the structure of every TNEF/MAPI property 
and how it's used internally so, for things like messages that MS 
explicitly says are not meant to interop with non-exchange platforms, 
it needs to be reverse engineered...

Yes, you are right, the reply was generated with a real exchange server.

It you can't fix this problem entirely it would be great if horde can 
simply ignore the wrong message and won't crash anymore.
But you already committed some code, so I think you already fixed this 
issue :)

So, this reply was generated by Outlook, connecting to a real Exchange 
server? NOT connected via ActiveSync, right?

The encapsulated reply does not contain enough information to generate 
a correct meeting reply. It's missing, among other things, the UID of 
the meeting, making it impossible to connect it to the original 
meeting. It's also missing the ORGANIZER since in Exchange the 
ORGANIZER data would be obtained from the parent MAPI email object.

My guess is that interop between an actual Exchange account and a 
non-exchange account in the use-case will just not work.  I can't get 
Outlook to send a response in this format while NOT connected to an 
Exchange server natively. The TNEF file probably contains some 
reference uid to the meeting's MAPI object on the exchange server, 
which we obviously don't have access to via Horde. I'm going to keep 
looking for a little bit more, but I'm close to giving up.

Changes have been made in Git (master):

commit 5830e1c8c34352db168a80a8c31b8b28e892bc92
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Wed Jan 21 10:26:32 2015 -0500

     These types of messages have explicit classes too.

     Part of Bug: 13799

  framework/Compress/lib/Horde/Compress/Tnef.php |    7 +++++++
  1 files changed, 7 insertions(+), 0 deletions(-)

http://github.com/horde/horde/commit/5830e1c8c34352db168a80a8c31b8b28e892bc92

For what it's worth, it eventually does load, but with no content to 
display, other than the attachments.

Looks like the reply is being sent encapsulated in a TNEF file 
(winmail.dat). We have a TNEF parser, but it must not be able to 
handle this particular reply for some reason. I'll look into it.

Thanks guys for your patience :)
Hopefully this file is what you need!

So I also would like to give you some more information, maybe it is 
important for finding the problem.
My mailserver runs on Debian 7 stable completely updated to the newest 
patches.
I run Dovecot and Postfix and the PHP version that is shipped with Debian.

Best,
Jens

No, RTF is useless for our purposes.

Open the email then:

File->Save As

Change the drop down menu in the save dialog from "Rich Text Format" 
to "Raw Message Source"

Well, I use Apple Mail and I only found one possibility to actually 
store the email on my hard drive. The result is again an rtf file. 
Please find the file attached. I hope that this is what you expect...

From your email client, save the message on the hard drive. Then 
attach it here.

Sorry for this "stupid" question, but I don't understand what you mean 
with "raw message". How can I get the raw message?

This is still useless. Don't copy and paste message sources. Attach 
the raw message file to this ticket instead.

Hi Michael!

I already provided you the raw message attached as rtf file.
However, here it is again as ASCII text.

Return-Path: <xxx@yyy.uni-leipzig.de>
Delivered-To: zzz@mail.nachthell.net
Received: from localhost (localhost [127.0.0.1])
        by mail.nachthell.net (Postfix) with ESMTP id 84522F80A5F
        for <zzz@mail.nachthell.net>; Wed, 14 Jan 2015 10:05:05 +0100 (CET)
X-Virus-Scanned: Debian amavisd-new at mail.nachthell.net
Received: from mail.nachthell.net ([127.0.0.1])
        by localhost (mail.nachthell.net [127.0.0.1]) (amavisd-new, port 10024)
        with ESMTP id U6LhsPP4mTXR for <zzz@mail.nachthell.net>;
        Wed, 14 Jan 2015 10:05:03 +0100 (CET)
Received-SPF: none (yyy.uni-leipzig.de: No applicable sender policy 
available) receiver=mail.nachthell.net; identity=mailfrom; 
envelope-from="xxx@yyy.uni-leipzig.de"; helo=v1.rz.uni-leipzig.de; 
client-ip=139.18.1.26
X-Virus-Scanned: by amavisd-new at v1-ul
X-Virus-Scanned: Debian amavisd-new at mrzs235215
Content-Type: multipart/mixed;
        boundary="_000_DAF4E05BF1B9A4479FE576CB92C9AA87873463ADS050003231mediz_"
From: "xxx, xxx" <xxx@yyy.uni-leipzig.de>
To: 'xxx xxx' <zzz@nachthell.net>
Subject: Zugesagt: Infoveranstaltung VDI/VDE Jena "Digitalisierung
  Medizintechnik"
Thread-Topic: Infoveranstaltung VDI/VDE Jena "Digitalisierung Medizintechnik"
Date: Wed, 14 Jan 2015 09:04:53 +0000
Message-ID: 
<DAF4E05BF1B9A4479FE576CB92C9AA87873463AD@S050003231.yyy.uni-leipzig.de>
Accept-Language: de-DE, en-US
Content-Language: de-DE
X-MS-Has-Attach:
X-MS-TNEF-Correlator: 
<DAF4E05BF1B9A4479FE576CB92C9AA87873463AD@S050003231.yyy.uni-leipzig.de>
MIME-Version: 1.0

--_000_DAF4E05BF1B9A4479FE576CB92C9AA87873463ADS050003231mediz_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable




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Content-Transfer-Encoding: base64
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--_000_DAF4E05BF1B9A4479FE576CB92C9AA87873463ADS050003231mediz_--

Please provide the raw email message.

Hi Guys!

I accepted a calendar invitation which was sent from Horde calendar to 
a MS Exchange server and received the acceptance reply email in Horde.
Then Horde shows the loading symbol but never shows the email.
The php-cgi processes that are started through my Lighttpd then use up 
to 60% CPU and one time the entire webserver crashed.
In my webserver logs I could not find error messages.
Also my horde.log does not show any failures.

Please find the email attached as rtf document.

Thanks for your help!
Regards,
Jens