HI, all I have 2 questions about EWS Development. Q1. I am developing the list of "OUTLOOK Tasks" using Exchange 2007 EWS. I want to sort with the following fields : 1. type(recurrence / non-recurrence) 2. attachments 3. message type(mail, task, schedule, ...) image : http://blogfiles8.naver.net/data29/2007/11/28/23/1_noelle75.jpg Should I use the "Extended Property"? If so, which "Extended Property" should I use? Q2. In OWA, I can filter "OUTLOOK Tasks" with following flags(All/Active/Overdue/Complete) image : http://blogfiles7.naver.net/data29/2007/11/28/166/2_noelle75.jpg How can I develop this logic using EWS or "Extended Property"? thanks, pblk. EggHeadCafe - .NET Developer Portal of Choice http://www.eggheadcafe.com