Thank you, Niel - you'll have to excuse my newness and inexperience to Mac OS's: I assume you are advising me that the software I already have installed will not be compatible with the Leopard update. If this is the case, will it be erased with the install? Will it have any effect on the 10.5.6 OS once it has been installed?
The sofware won't be erased, but it also won't run any longer under Leopard. You could still boot to OS9 and use it there, but that rapidly becomes an inconvenience.
You can consider upgrading to 10.5 but you'll still be way behind in terms of new applications because Apple is now at 10.9. I still run 10.4.11 and while there are a few applications out there I might wish that require 10.5 I have not upgraded.
- If they require 10.5, do they also require an Intel computer?
- If you just need a more modern browser try TenFourFox which runs on PPC Macs but is kept up to date.
- Some people complained about 10.5 slowing down their computers.
- If you don't have Leopard already consider it may cost $100
- You don't say how much RAM on your computer. You may need a RAM upgrade. Add that to cost of Leopard vs. buying a newer used computer.