At this time, CallStation only supports Windows 2000, XP, Vista, and Windows 7. No, it does not support Windows 8.1 but you could try to run it in compatibility mode since it works perfectly for Windows 7. Right click the setup package and use Troubleshoot Compatibility then select Windows 7. Chances are it works this way until a Windows 8.1 compatibility fix is released. Additionally, check the official website once in a while to stay updated with the latest releases of CallStation.