I setup a new VMware ESXi 4.1 Update 1 server and tried to migrate several virtual Windows 2008 server from an ESXi 3.5 server. But they all failed with the message "FAILED: An error occured during the conversion.", sometimes 1 minute into the migration, sometimes up to 37%.
Before migrating, all the configuration parameters seems correct, no warning or errors.
I am using vCenter Converter Standalone v 4.3 , and I have tried setting the target to both v4 and v7 of the appliance.