I'm wondering how much of a change in user ability a senior would experience by changing from Mac OS 8.6 to OS X 10.5. He mainly uses it for internet browsing and some document work but he has been using 8.6 since it came out. Pretty basic stuff. He is also wondering how difficult it would be to set up a new iMac? i.e. power plug-in, internet set-up, account set-up... Finally, what type of system would he be using? He is using a really old iMac but he doesn't know what type. He also doesn't know what type of ports he has so how would he transfer files over? Thanks for your help guy!