Outlook 2010 - Unable to update a meeting created by me

hi everyone,

I am recently facing this issue intermittently with some of the meetings in Outlook 2010 sp1. we are running exchange 2010 sp2.

After receiving the response from any one of the attendees I am unable to send any update /modifications to the attendees. I don't see an option to send updates. the only option I get is to save & close. There is no particular pattern that it happens with a single meeting or a recurring meeting. And also the issue is intermittent and doesnot happen always with all the meeting that I create. there is also no delegate managing the calendar other than me.

please let me know a possible fix for this.