Is ColdFusion 8 backward-compatible with previous releases of ColdFusion?
ColdFusion MX (6.0, 6.1, and 7) applications should seamlessly migrate to ColdFusion 8. Most ColdFusion 5 applications can also be migrated easily to ColdFusion 8. For details on migrating from ColdFusion 5 or earlier to ColdFusion 8, visit the ColdFusion MX migration resources section of the ColdFusion Developer Center.