You can Even if you don't turn off the response option when you initially send the meeting request, you can change the option at any time. Open the meeting. On the Meeting Ribbon. In the Attendees group, click Responses. NOTE: For recurring meetings, the Meeting tab appears as the Recurring Meeting tab. Uncheck Request Responses. Click Send Update (It is necessary to click Send Update so that the meeting request is updated in Outlook for all meeting attendees) According to this article on, certain updates must be sent.
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