virtualbox 4 does not migrate old vms

[ebonweaver]

there may be a reason for this, but on the surface it seems to create a confusing split situation. New VMs are created in the new location and file structure of version 4.x, and while it reads the old VMs from the old location and structure, it does not migrate or upgrade them. This results in storage of VMs in two locations instead of one which is not optimal.

[Frank Mehnert]

This is intended and I don't see the confusion. Old VMs are still manageable using older versions of VirtualBox.