My MX510 isn't supported anymore by Logi.

[BelgianBoy]

Is there a freeware for configuring buttons of a mouse?

 

[chrfr]

Is there a freeware for configuring buttons of a mouse?

SteerMouse will likely work, but it’s not free. Good software seldom is free.

 

[BelgianBoy]

10$ is not much. Is nearly free... thks for the tip.

 

[T'hain Esh Kelch]

USB Overdrive works wonders for my MX510.

 

[Fishrrman]

USB Overdrive (which will run forever in "free mode", I think)
or
SteerMouse (excellent, not free, but cheap).

 

[BelgianBoy]

USB overdrive is fab.