Re: Calendar events sent to Outlook client do not work

Mat Cantin wrote:
> On 2013-03-28 10:22, Thomas Brüderli wrote:
>> Mat Cantin wrote:
>>> On 2013-03-28 0:38, Thomas Brüderli wrote:
>>>> Mat Cantin wrote:
>>>>> I'm testing on Outlook 2003, OWA on Exchange 2003, Outlook 2007, 
>>>>> and
>>>>> Office 365 webmail.
>>>>>
>>>>> I can provide the emails I'm sending as attachments so you can see 
>>>>> the
>>>>> headers if that helps, let me know.
>>>> And even more interesting would be a full email source of an iTip
>>>> invitation that actually works in Outlook. That might help us find 
>>>> the
>>>> difference.
>>> Would an invite email generated from an Outlook client work? I've 
>>> attached
>>> an email from an Oulook to Outlook which works: 
>>> meeting-from-outlook.msg.
>>> And a message from Kolab with the patches that does not work:
>>> meeting-from-kolab.msg.
>> Thanks for that. At first sight, I see an additional header
>>
>>   Content-class: urn:content-classes:calendarmessage
>>
>> Maybe that already does the trick. I'll try to compose a patch for you 
>> to test with.
>>
>>[...]
>>
>> Maybe you can verify whether an invitation from Gmail works with 
>> Outlook 2003.
> 
> A test invite form Gmail to all the Outlook versions I'm running 
> worked.
> 
> I can confirm that the invites work in Outlook 2010, but they don't 
> work in Office 365, Exchange 2010 OWA, Exchange 2007 OWA, Exchange 2003 
> OWA, Outlook 2007 or Outlook 2003. OWA 2007/2010 and Office 365 actually 
> renames the event.ics file to "not supported calendar message.ics".

It's great that MS keeps their product generations in sync :-)
> 
> Let me know about the patch, I can test against all the Outlook 
> platforms pretty quickly now that I've got my accounts all setup. :-)

Please find attached a patch that adds the Content-class: header. If
that doesn't help, we can try the Gmail way and add the ics part with
Content-Type: application/ics

Regards,
Thomas

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diff --git a/plugins/calendar/lib/calendar_itip.php b/plugins/calendar/lib/calendar_itip.php
index 6ff5b6b..6b21492 100644
--- a/plugins/calendar/lib/calendar_itip.php
+++ b/plugins/calendar/lib/calendar_itip.php
@@ -159,7 +159,9 @@ class calendar_itip
     // attach ics file for this event
     $ical = $this->cal->get_ical();
     $ics = $ical->export(array($event), $method);
-    $message->addAttachment($ics, 'text/calendar', 'event.ics', false, '8bit', '', RCMAIL_CHARSET . "; method=" . $method);
+    $message->addAttachment($ics, 'text/calendar', 'event.ics', false, '8bit', '', RCMAIL_CHARSET . "; method=" . $method,
+        '', '', null, null, '', null,  // language, location, n_encoding, f_encoding, description, h_charset
+        array('Content-class' => 'urn:content-classes:calendarmessage'));
     
     return $message;
   }