Eyebeam 1.1 for Windows installs and runs correctly on Mac running OS 10.5.1 using Crossover Mac 6.2.1 but it seems to have issues with the speaker and mic. Installation and operation was fine but once the speakers and mic had to be calibrated or used, sound input or output seemed to be problematic. Since this is a SIP program for making calls over the computer, this issue rendered the program useless.