Mailing List Message #94963
From: Marcel Hochuli <>
Subject: Re: Winmail.dat question
Date: Tue, 6 May 2008 00:31:58 +0200
To: CommuniGate Pro Discussions <>
X-Mailer: Apple Mail (2.919.2)

Have you consulted the E-Mail-Header? Does it contains a line starting with "X-MAPI-LastModified: Fri,...."

Look in the mail archive for Subject "Outlook re-assembling mail in InBox with winmail.dat".

Maybe it is the same problem. (The solution still is Niversofts Winmaildat script).



Am 05.05.2008 um 17:35 schrieb James Roman:

We've seen the same behavior.  We would have one person draft a broadcast e-mail message. Then they would send it to another individual for approval and distribution. The original e-mail message from outlook is fine. Once the approver opened the message, it would change. Unfortunately we have numerous recipients who still regularly use terminal based e-mail clients. The winmail.dat file makes it unreadable by most text-based mail clients.

We did some tests where we had individuals send messages to themselves. We saw that as soon as Outlook touched the message, it modified it. So if Outlook is configured to mark a message as read after 5 seconds, you get a winmail.dat. Outlook has the preview pane enabled, you get a winmail.dat. If you sent two messages to yourself from a non-outlook client and then opened Outlook, the top message would get opened and a winmail.dat appended. If you left the second message in the list alone, you could close outlook and still open it in another client.

There was a quite a bit of activity on this topic in the Thunderbird development list at the time. I believe that Thunderbird borrowed some code from kmail to be able to parse these winmail.dat messages. We ended up going with a workflow tool for broadcast messages to get outlook out of the loop.

Actually, we are using the Winmaildat filter from Niversoft. Also this is occuring after the message is received. We have a rule that captures the messages just before they are written to the mailbox. The captured version does not have a Winmail.dat attached to it. It seems the Outlook modififed the message and wrote it back to the mailbox. All the settings that I have found are set to HTML rather than RTF.

The piece of this that really confuses me that it seems to only be occuring on messages forwarded to him from his secretary. I really don't think this is a CG problem more as it is an Outlook problem, but was just wondering if anyone had ran into this before.

On Fri, 2 May 2008 13:55:36 +0100
Peter Clark <> wrote:
> We had this issue, and found it was best to simply
>install this script rather than diagnose the exact cause
> On 2 May 2008, at 08:44, Martin.Hepworth wrote:
>> Jason
>> Make sure outlook it set to default to html and not RTF.
>> alsorts of issues with RTF emails (security and
>>usability) so best
>> to make sure it's set to html whatever.
>> --
>> Martin Hepworth
>> Snr Systems Administrator
>> Solid State Logic
>> Tel: +44 (0)1865 842300
>>> -----Original Message-----
>>> From: CommuniGate Pro Discussions
>>> [] On
>>> Behalf Of Jason Vervlied
>>> Sent: 01 May 2008 18:24
>>> To: CommuniGate Pro Discussions
>>> Subject: Winmail.dat question
>>> Hello,
>>> We are having an odd issue that we can't seem to figure
>>> Sometimes
>>> one of our clients will receive a message that is
>>>forwarded to him
>>> from outlook. He receives the message just fine with
>>>html and plain
>>> text MIME parts. But after outlook downloads the
>>>message, a
>>> Winmail.dat is appended to the end of the message. Then
>>>whenever he
>>> tries to view the message with his iPhone all he can see
>>>is a
>>> Winmail.dat and if there are other attachements, he can
>>>see those,
>>> but
>>> the body of the message is in the WInmail.dat.
>>> Any of you have an idea what setting in outlook could be
>>>causing this
>>> behavior? He is set to send HTML message to Internet
>>> --
>>> Jason Vervlied
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