I have one iMac running 10.6.8 that i bought when 10.7 was released but wasn't installed on my computer. I have been hesitant over the last 2 years to upgrade to 10.7, 10.8 and now 10.9 fearing that some of the programs on my computer will not work on the new OSX. How can I tell what will and won't work? Is there a central repository that lists what software will/will not work when you upgrade? I'm perfectly fine with sticking with 10.6.8 but also realize that at some point this won't be supporting by Apple in any way. Thanks for an advice in advance!