Currently Being ModeratedJul 23, 2013 3:51 AM (in response to din90)
It looks like you need Snow Leopard or higher:
Currently Being ModeratedJul 23, 2013 3:52 AM (in response to din90)
You don't, a 10.5 era laptop is too outdated for the lastest OS X versions.
The best you can do, and should do, is upgrade to 10.6.8 since 10.6 is getting security updates still, but not for too much longer and further than 10.6.8 will slow it down and not run your older PPC based software, just costs too much to buy all new software verisons.
Your really looking at buying a new computer + software to work with your iPhone 5 and upcoming iOS upgrades.
That's the smarter choice than trying to upgrade OS X to 10.7 or 10.8 or new 10.9 on a old box.