Please Very urgent - WEBDAV method - REgarding

[ArunkumarSundaravelu]

Hi We create application which was used webdav method using this we fetch mails from exchange server for a particular mail id (like xxx@uuu.com) We fetch Inbox Mails and Sent Items folder mails and insert into two tables (sql server) My problem is, I want relate to Inbox Mail and Sent Item Mail If One mail is come from in my inbox say like "New Mail.EML" when i reply to "New Mail.EML" it stored in sent items folder as "RE:New Mail.EML" i want how to find relationsship between NewMail and RE:NewMail Which Property in webdav method , to determine this relationship Expecting Earlier answer By Arun