Why stop using it?
Just because it is a Microsoft device is hardly a valid reason. You're not hurting MS by stopping using it, they already have your money. Further than that, you are hurting yourself by wasting a perfectly functional piece of hardware.
People ceasing to use Microsoft software is rational, because it is shite. But throwing away your intellimouse PURELY because MS make it? Ridiculous!
It does what it's supposed to do doesn't it? If it ain't broke...
Now waiting until it breaks, _that's_ a good idea.