The Migration/Configuration portion of the ColdFusion MX 6.1 and ColdFusion MX 7 installations, which normally is only run the first time the ColdFusion Administrator is opened, can be run again after the install has been completed. Enabling RDS, re-installing the ODBC services, or migrating settings from a previous version of ColdFusion are reasons why you may want to run it again.
Once the initial step of installing the ColdFusion application files is completed, a second step occurs the first time the ColdFusion Administrator is accessed, as shown below. Note: This is a screenshot from a ColdFusion MX 6.1 installation but the same information applies to a ColdFusion MX 7 installation.

