DroboPro Migration?

Since the DroboPro is now considered an unsupported, legacy product, which of the current models can I migrate an existing drive set to and retain all of the data? Either of the B800 models?

I’m currently only using five drives in my DroboPro, could I migrate to a Drobo 5D or 5N?

It seems you can’t, unfortunately: http://www.drobo.com/resource-center/migration/