What we want to do is when user access an email either from Outlook or OWA
or Blackberry, Exchange can callback to our program, then our code can go to
our EEA system retrieve the email and then put it back to the mailbox, then
user can see a complete email.

I think originally Exchange Store Event Sink can do this ,but after reading
the Exhange SDK,I found that it can't.The Exchange Store Event Sink only
provide Timer,Save and Update event,but not involves READ event . Another
road I have to seek for ... what about Exhange Agent ? Anyone can tell me if
it is feasible?

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