Macintosh System Requirements Macintosh computer with G3, G4 or G5 processor , MAC OS X v.10.4 (Panther) or later, 128 MB RAM 150 MB Free hard disk space, One free USB port (USB 1.1 or USB 2.0), An Internet connection (dial up: 33kbps minimum or broadband), Skype downloaded to your MAC OS X