Knowledgebase: iPad/iPhone/iPod touch
Updated response is not sent when responding to a meeting a second time
Posted by - NA - on 30 June 2009 04:32 PM
iPhone/iPod touch/iPad calendar allows you to respond to a meeting a second time and change your response if you originally responded with an "Accept" or "Tentative." 
If you respond a second time, however, using the responses in the calendar item, the MeetingResponse command is not sent and the item is not updated with the response.
The device does send an email to the meeting organizer and a change for the calendar event (with no information about the response).