Currently Being ModeratedJun 12, 2013 1:56 PM (in response to Blake 187)
Your specs say OS X 10.6.8 which would be the last updated version of iChat 5
This version cannot use the @me.com and @icloud.com IDS issued under iCloud.
This is because the iChat 6 and Messages apps in Lion and Mountain Lion have a second login to Apple that then allows the AIM servers to read the Password as an extra security measure which is not present in iChat 5.
However @mac.com Apple IDs continue to work.
Another issue is that Apple let you have really long Passwords and seem to encourage this.
However the AIM servers only allow passwords up to 16 characters.
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously