Rosetta Stone Language Software and Leopard

You could e-mail the program makers technical support and ask them if things will be compatible on day one.

 

As an owner of various books and Rosetta Stone Japanese edition, I want to let you know that Rosetta Stone is not great for jumping into the Japanese language. I'd recommend getting a decent book with audio CD. If you want recommendations/help with Japanese, feel free to PM me.

You may already be experienced, if that is the case then ignore my comments.

As for Rosetta Stone working under Leopard, I don't think it would be broken in Leopard if it works in Tiger under Rosetta (Mac Rosetta, not the Rosetta Stone software!)