exchange 2003 and excnahge 2007   

We recently install a exchange 2007 in our domain, here's  the problem users 
on exc 2007 can send mail  to internal domain without problem but cannot send 
outside. and users on exc 2003 cannot reach a users on exc 2007 in the 
internal domain an the users on exc 2007 cannot receive mail from outside. I 
could see my two connecteur.

date: Mon, 17 Mar 2008 07:41:10 -0700   author:   Ron