My organization currently has one Exchange 5.5 server running on NT 4.0 Platform. We have already upgraded our NT 4.0 Domain to Windows Server 2003 ADS. Now we have introduced another Windows 2003 Server in which we going to use to migrate over to Exchange 2003 from the old Exchange 5.5 server.
The installation of Exchange 2003 went smoothly with no errors but I change the LDAP port on the Exchange 5.5 server from 389 to 390. I didn't want it to interfere with the Active Directory. The ADC connection went well too. Now here's my problem. In the process of moving mail boxes over to Exchange 2003, all the mailboxes that reside in this new server can only send mail and not receive mail. I know it must be something silly, but show do I fix it so that mailboxes on the new Exchange 2003 server can receive emails?