I still have some issues with iMessages, also after I did the 'Great Idiot's Guide':
My own - older - AppleID works an real MacPro3,1 and Hackintosh MacPro3,1 (P35-DS4/Q9550) and daughters (H77N-WiFi/i7 3770) after calling Apple support a year ago. Also on iPad2
My daughters -new- AppleID...