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I am sending an Outlook meeting request with my .NET-program using the following as a source: Sending Outlook meeting requests without Outlook? This worked well for me, but I still have one problem/question.

If I send an invitation directly with Outlook I have the possibility to define that I DONT want an answer (accept, decline, ..) from the invited people. So if the invited people open my mail they dont see accept, decline... buttons.

I want this behavior also if I send auto-generated mails with my .NET-program. Is there an option to deactive the answer-feature programmatically? So that receivers DONT see accept, decline... buttons if they open my auto-generated mails?

I already tried to set RSVP = False, DISALLOW-COUNTER = True:

BEGIN:VEVENT
ATTENDEE;CN=receiver@mail.de;RSVP=FALSE:receiver@mail.de
SET X-MICROSOFT-DISALLOW-COUNTER:TRUE
.
.
.
END:VEVENT

I saved two ICS-Files with Outlook - one with answer enabled and one with answer disabled. The above two lines were the only different ones, but it doesn't work in my generated message. If I open the mail it still shows the accept, decline, ... buttons. Any idea?

EJoshuaS - Stand with Ukraine
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tveng
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    Have you tried RSVP=FALSE (Just in case its case-sensitive)? – Miika L. May 03 '12 at 07:19
  • Yes i tried it, still dont works. – tveng May 03 '12 at 07:23
  • This works fine for me, you need to share the full ICS file. I don't get the Accept/Tentative/Decline when RSVP=FALSE. – SliverNinja - MSFT May 03 '12 at 13:29
  • I confirmed RSVP=FALSE is case-sensitive in the spec. However, setting it to FALSE for me still has outlook 2007 prompting accept/decline too. Not sure what the magic settings OL is wanting to suppress accept/decline. METHOD=PUBLISH in event too :/ – Mark Nadig Aug 16 '12 at 21:58

1 Answers1

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I believe you are talking about Outlook's "Request Responses" option. When that is unchecked, Outlook generates .ics files with RSVP=FALSE for all attendees. When the attendee receives this, they will still see Accept, Tentative, Decline buttons, but these buttons won't send a response, they will simply determine how or if this invitation is added to their own calendar.

If "Request Responses" is checked then RSVP=TRUE is used for all attendees which will cause their Accept/Tentative/Decline buttons to also show options for Send the Response Now, Do Not Send a Response (this is equivalent to what happens when Request Responses wasn't checked), and Edit the Response before Sending.

Oran Dennison
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