In Normal Exchange 2010, when new message arrive, the message will mark as unread in OWA; Outlook and ActiveSync When i click on the message it will become read status May i know when the message arrive, is it the mailbox server will mark the message to read and sync to OWA; Outlook and Activesync?? After arrived, the message will be triggered to read by outlook; owa and Activesync than sync to Mailbox server??? I want to know more details I try to found on technet all day, but i still cannot find the information. Could someone help me and share the information?