The default LDAP port for Exchange 5.5 server is 389. If your Exchange server is running on a
Domain Controller and you are planning to upgrade or migrate to a higher version of Exchange,
it is necessary to change the default LDAP port 389 in Exchange 5.5 Server and specify a free port.
I just finished the "Upgrade from Exchange 2007 to 2013" Part I screencast and must tell you that it is extremely well done! I found no variances between the video/script and what I experienced. At the end of Part 1 ...
Bob Duffett, Priority Software Inc. ...more...