Hi!

I've build to tool which creates outlook appointments. I create a ICS
file and send it as a attachment to different receivers. That works
very well.

The receivers can confirm or decline those appointsments and outlook
generates email back to my system. My outlook and other test
installations create email which are readable for me:

----------------------------------
[...mail headers...]
BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN
VERSION:2.0
METHOD:REPLY
BEGIN:VEVENT

DTSTART:20080213T090000Z
DTEND:20080213T093000Z
TRANSP:OPAQUE
SEQUENCE:0
UID:epluscrm103
DTSTAMP:20080204T160005Z
SUMMARY:Accepted: 2222 Bitte diesen termin dem kalender hinzufuegen -
muss
wissen\, wie die bestaetiugng aussieht KUNNR 0000228001
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
alid
END:VEVENT
END:VCALENDAR
----------------------------------

but the outlook of my customer sends a damned winmail.dat:

----------------------------------
[...mail headers...]
Content-Type: multipart/mixed;
boundary="----_=_NextPart_001_01C86745.00C076DC"
Subject: Zugesagt: TEST-040208 KUNNR 0000228001
Date: Mon, 4 Feb 2008 16:45:45 +0100
Message-ID: xxxxxxxxxxxxxxxxxxxxx
X-MS-Has-Attach:
X-MS-TNEF-Correlator: xxxxxxxxxxxxxxxxxxl
Thread-Topic: TEST-040208 KUNNR 0000228001
thread-index: AchnRP5XqUVAPrFtTUKKGcbevQFe0wAAALQw
From: "Wxxxxx Johann"
To: "xxxxxx CRM"

This is a multi-part message in MIME format.

------_=_NextPart_001_01C86745.00C076DC
Content-Type: text/plain;
charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable


------_=_NextPart_001_01C86745.00C076DC
Content-Type: application/ms-tnef;
name="winmail.dat"
Content-Transfer-Encoding: base64

eJ8+Ii0PAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAA DoAAEIgAcAIAAAAElQTS5NaWNy
b3NvZnQgU2NoZWR1bGUuTXRnUmVzcFAAVwsBDYAEAAIAAAACAA IAAQSAAQAoAAAAWnVnZXNhZ3Q6
IFRFU1QtMDQwMjA4ICBLVU5OUiAwMDAwMjI4MDAxABoKAQWAAw AOAAAA2AcCAAQAEAAtAC0AAQBQ
AQEGAAMADgAAANgHAgAEABEAAAAAAAEA9wABBwADAA4AAADYBw IABAARAB4AAAABABUBAQgABQAE
AAAA//////wDASCAAwAOAAAA2AcCAAQAEAAtACwAAQBPAQEJgAEAIQAAADY1 MzQ3MTc5OTQyQUM0
NDU5MDE2MjAzRjg3Qjk4MzU0ANMGAQOQBgCsDwAAeQAAAAsAAg ABAAAAAwAmAAAAAAALACsAAAAA
AAMANgAAAAAAQAA5AIAaKgFFZ8gBHgA9AAEAAAALAAAAWnVnZX NhZ3Q6IAAAAgFHAAEAAAA0AAAA
Yz1BVDthPSA7cD1MaWJybztsPUxJQkFURVhDSDE0LTA4MDIwND E1NDU0NFotMTA3NDgyAEAAYAAA
wMj+RmfIAUAAYQAA9KovS2fIAR4AcAABAAAAHgAAAFRFU1QtMD QwMjA4ICBLVU5OUiAwMDAwMjI4
MDAxAAAAAgFxAAEAAAAbAAAAAchnRP5XqUVAPrFtTUKKGcbevQ Fe0wAAALQwAB4AGgwBAAAADwAA
----------------------------------


Of course I can decode this encode64 part but all I get is a
absolutely unreadable winmail.dat. There are many tools which should
be able to convert the winmail.dat code but they are not working very
well.

Is it possible to tell outlook with the ICS calendar file that it
should NOT answer with a winmail.dat file? I need a readable response.
Help help help!

The template for my ICS looks like that:

BEGIN:VCALENDAR
PRODID:-//CMS42 by lemon42//EPLUS CRM//EN
VERSION:2.0
METHOD:{method}
BEGIN:VEVENT
ORGANIZER;CN="EPLUS CRM":MAILTO:{fromemail}
DTSTART:{timestart}
DTEND:{timeend}
LOCATION:{location}
TRANSP:OPAQUE
SEQUENCE:0
UID:{uid}
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="'{empfaengeremail}'":MAILTO:{ empfaengeremail}
DTSTAMP:{timestam}
DESCRIPTION:{description}\n
SUMMARY:{subject}
PRIORITY:5
CLASS:PUBLIC
BEGIN:VALARM
TRIGGER:-PT15M
ACTIONISPLAY
DESCRIPTION:Reminder
END:VALARM
{status}
END:VEVENT
END:VCALENDAR

greetings from vienna,
jens

DONE. That took me hours!!

Solution:
decode64 the attachment, so you get the winmail.dat.
Search for "MtgResp" in the binary. The next byte is the status:

MtgRespP = Accepted
MtgRespA = Tentative
MtgRespN = Declined

To identify the appointment ID you should use a prefix for your
appointment. My script uses:

UID:epluscrm103

So I look for "epluscrm" in the unreadable binary trash and take all
bytes till the next 00-byte.

Ups - I sat not at my computer. The question and answer came from the
same person: me. I hope I could help somebody with my solution...