Last year I migrated from vcenter 5.5 windows physical server to a 6.5 appliance. I used the migration tool that created the appliance and migrated all the configuration and data to the new server. I have been looking at what it takes to upgrade from 6.5 to 6.7U1 and it looks like the same process that I used to migrate to 6.5 from 5.5, why is it necessary to create a whole new appliance and migrate all the data and configuration again? Is there any other method to do this?