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List:       kde-pim
Subject:    Re: [Kde-pim] Invitation sending from KOrg/KMail and Outlook
From:       Till Adam <adam () kde ! org>
Date:       2004-12-23 10:01:54
Message-ID: 200412231101.58386.adam () kde ! org
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On Wednesday 22 December 2004 23:32, Reinhold Kainhofer wrote:
> Currently KMail has a (nasty) workaround for sending invitations in the
> body of the mail to make Outlook detect that the mail is an invitation.
>
> In bug report 93824 an example of an Outlook-generated invitation is given,
> where the invitation also is a multipart message (albeit it's
> multipart/alternative, not multipart/mixed like kmail's message) and
> contains a human-readable description of the event.
> I'm attaching both that outlook-generated and a kmail-generated invitation.
> As one can see, the only relevant differences seem to be:
>
> Outlook-generated:
> -) Content-Type: multipart/alternative
> -) includes Content-class: urn:content-classes:appointment
>
> KMail-generated:
> -) Content-type: multipart/mixed
> -) Uses Content-Disposition (i.e. the ics is marked as attachment)
>
> Would it be possible to make KMail generate invitations similar to the
> Outlook-generated one? We could then get rid of the dirty hack of inserting
> the ics into the body.
>
> I'm not sure whether the Content-Type or the Content-class or the
> Content-Disposition is the key to make Outlook recognize the invitation...

I had been wondering the same thing and apparently the requirement stems from 
the times of interoperability with Exchange 5.5. Bo told me that he 
discovered it was necessary for the old kroupware, and so he figured it would 
still be necessary today. Note that there are two different cases:

1) new invitation:
  those are generated as either top level (inline) iTip or mime mails in 
  Kontact, depending on a config switch, OL in current versions (>=2000 I 
  believe) generates mime invitations. We fear (but I personally would really 
  like someone to confirm that) that older OL only understands inline

2) replies and updates to invitations
  Kontact always generates those inline, not as mime mails, I asked Bo once
  and he said he believed it the right way to do things. I think OL also 
  produces top-level, inline iTip messages for these. Again, confirmation of
  that would be nice to have.

Then there is the additional issue of signed and/or encrypted invitations and 
answers which I would like to sort out eventually. From the little testing 
we've done, I don't think OL copes with either, at this point. Feel free to 
correct me on this. Kontact can currently handle signed and encrypted 
invitations, but not updates coming from KOrganizer, I don't think.

Just thought I'd throw in what I know, I've always felt uneasy about this kind 
of doing things based on suspicions and myths passed on among team 
members. :)

Till

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