10.5.8 is the highest version of OS X you can go to with an update.
To go to a newer version you must upgrade which requires a purchase. The next upgrade would be 10.6. To get that you will have to call Apple and purchase it
Apple has resumed selling Mac OS X 10.6 DVDs in its online store; phoning them is no longer needed.
I guess there was more phone traffic then they wanted for the Snow Leopard DVD.
It always seemed like a silly idea to dropped it when they did.
Very silly Allan, and probably more expensive too, paying for staff time having answer the phone instead of for people doing it for themselves over the electric internet web thing.
Retrieving data ...