Microsoft Arc Touch mouse doesn't want to connect in MacOS High Sierra
Solution 1:
After a while, the mouse starts working with the next solution, but still, I don't know if it will fail again.
- In System Preferences > Bluetooth at the devices list, delete mouse and keyboard pairing (maybe keyboard was in conflict, I don't know)
- Pair the mouse. Turn on, press the Bluetooth button, wait for the device to be identified and connect.
- Then turn on the keyboard and connect.
Solution 2:
I get the mouse working with macOS High Sierra 10.13.4 by pairing it a few times per day, as it is going to sleep constantly, never reconnecting on its own.