I bought a Microsoft Ultra Thin Designer mouse from Amazon. It's a beauty and the site said 'compatible with Mac' but MS say differently....Back it went for a refund. I have a basic MS wireless mouse, with tiny dongle, it works a treat, trouble is the dongle, having to install/remove it every time. I'd sooner not leave it installed for safety reasons. 'EVERY' review I've read of BT mice for Mac basically says they are a no-no, even Apples Magic Mouse, slow inaccurate tracking and they loose wifi all the time. Anyone actually have a BT mouse for Mac that actually WORKS all the time.