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Does anyone know what iCalendar conditions I need to force the 'Accept/Decline' buttons to appear in an updated meeting message for Outlook 2007? Is there a combination of regular iCalendar fields, or some X-MICROSOFT fields I'm missing out on to force a re-accept? Our updates come far enough after the initial message to make a re-accept mandatory. I see this note for Outlook 2007, and I'm hoping that some combination of values will force an 'Accept/Decline' - short of a change of value in DTSTART. "If changes are made to meeting details, attendees receive an update with the changes highlighted, rather than having to reaccept the meeting." -- http://office.microsoft.com/en-us/outlook/HA100743061033.aspx This problem occurs for updates to single, non-recurring, UID only meetings as well updates to recurring meetings using RECURRENCE-ID and UID. We use the ATTENDEE line in the update such as: ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE; CN="Full Name":MAILTO:user@domain.com to attempt to force the Accept/Decline behavior. Thank you everyone! ICAL messages are below. I needed to place the ATTENDEE records in the initial message to please Notes, but tested without those lines to the same effect. I also tried sending the initlal message as METHOD:PUBLISH and the updates as METHOD:REQUEST. The records update, but no new Accept button is offered in Outlook 2007. We bump the SEQUENCE number for each update. INITIAL MESSAGE BEGIN:VCALENDAR METHOD:REQUEST PRODID:-//Product/Platform/Name//EN VERSION:2.0 BEGIN:VTIMEZONE TZID:America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;

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