When receiving the meeting request, it indicates no response is required, but it does not appear in calendar. But i found out that: People with blackberry accounts and office 2010 when they receive the e-mail and you see the No Response required And from troubleshooting fount that we Do NOT have to hit the “No Response Required” button if you get a meeting update; it will remove it from your calendar. INSTEAD – Click the “Change Response” button and reaccept. But when they do they get the message “The property does not exist. The field you want to modify is not valid for this type of item." we are using exchange server. Any help is appreciated.