Unfortunately, I can't say - I use it on Windows 7 and Windows 8.1, along with Android without issues. One thing I do that Skype appears to discourage is restart the application. This means don't allow it to launch on startup, I don't save my password (this is my practice with most apps), and I kill it if I know I won't need it; the latter is not practical if you need to be in constant touch with teams. I am not sure if any of this is a factor in my experience.