Can I append to a body of a clanedar item using EWS 2007?   

Is it possible to append to the body of an exisitng calendar item? I am 
trying

calendarItemType cal = new CalendarItemType
PathToUnindexedFieldType appendBodyField = new 
PathToUnindexedFieldType(UnindexedFieldURIType.itemBody);

cal.Body.Value = "Approved by Supervisor on " + 
DateTime.Now.ToShortDateString();

AppendToItemFieldType addApprovalMessageToBody = new 
AppendToItemFieldType(appendBodyField, cal);

Thanks,
~ck

date: Mon, 5 May 2008 10:12:49 -0700   author:   CK