I am about to perform an Exchange 5.5 to Exchange 2007 migration, using the ADC to move via Exhange 2003. There is a new AD domain and trusts setup between that and the NT domain. We want to rename the Exchange Organisation and are trying to establish when is the best time to do this. Should we change it on Exchange 2003 before we migrate users via ADC or should we wait and change the Organisation name on Exchange 2007 before we migrate to that new platform from 2003? Does anyone know what pitfalls we may come up against?