I hope it's ok to continue this old thread. Our issue is related, so it might be helpful to others with similar issues.
We have two ESXi hosts - an old one where backups were done with Backup Exec, and a new one where we do them with Veeam. We've been gradually migrating servers to the new host, but without vMotion this is very slow and requires a lot of down time. The biggest servers are still to be done, left till last because they'll take so long.
I've discovered that Veeam Free can be used to do the migration without down time. Can we just use our already installed and licenced copy instead of installing the free one? It's only licenced for the new host. What are we allowed to do concerning the old host?