synctoy probably does not have permission to read for those folders
Obvious but unhelpful.
If I run Sync Toy with Entourage running, I get 3 additional No Permission errors on files Entourage is using, so it makes sense that it can't copy in use files.
But I'm getting the original error when Entourage is not running. Is there a permission setting -rw etc that might be set to make it copyable?