[ovirt-users] Import/export VMs from/to Vbox, Vmware

Hi All, I'm trying to import/export ova files between oVirt and other platforms (Virtualbox / Vmware workstation), however, this is not working for some reason. it's important to have oVirt compliant with these platforms, to easily migrate Vms between them. Can anyone comment on this, is there a way to convert the vms ? Thank you in advance.