not recommended for Windows 8.1

repeatedly led to interruptions in the function. Back to the top half only disconnect the device and re-connect again to the well no longer worked. After many attempts, even replacing the mouse (thanks to Amazon for promte completing my) I have the Lenovo Support contacted on suspicion of hardware problems in the Think Pad. Several attempts to update the Bluetooth drivers were not successful.
Result: According to the Lenovo Support this mouse is incompatible with Windows 8.1. compatible. This is also confirmed because, on other computers with other operating systems does the otherwise perfect mouse very well.
It remains unclear who has worked here bad ..... Intel where the driver is coming from or Windows should implement all or Lenovo. Anyway, I can when using Windows 8.1. only advise.