How to synchronize contents of boxes between GW2012 and Exchange2010 ?

for example:
in GroupWise2012 there is a mailbox: user1
in Exchange there is a mailbox: user1e

it is necessary that mailbox contents in user1e (in exchnage) always were identical to contents(mails. appoitments, tasks, work in progress..) of a box of user1(GroupWise2012)