1. I have a backup of all the mail and i have reinstall exchange server , so how do i import the previous mail in the new mailbox. 2. I have configured exchange 5.5 in windows 2000 server . the problem is every thing is working fine , all the clients are sending mail and receiving them but if any client uses OWA to send mail , the mail return from the system administrator , and give the error message that recipent name unrecognized. It is urgent, can any body help me out in these matter. Regards A.Basit