Hey guys, I'm a Network Administrator for 2 companies and we already have hosted our Domain Names with two different ISPs,and I'd like to host these mailboxes and manage it from my site so, I started to learn about Exchange Server 2003 and would like to gradually tranfer fro the ISPs to Our Exchange server. First of all I'd like to make my Internal Exchange server Backup for the Two External servers, Then - after everything b stable - Make all Management from my Internal Server. - Can I manage mailboxes for two domain names (like abc.com and xyz.com.eg) using one exchange server 2003 standard edition? - Also, How can I make my Exchange server as Backup server for the two main mail servers of my 2 compnies? - How to make all external users send their messages to my internal Exchange server instead of Current External one that is managd by My ISP. ( is it done by refering to the IP Address of Domain Name Hosting Company? where to set this reference? Regards SO THANX