On the positive side, the Microsoft Wireless Mobile Mouse 3500 works. I bought this wireless mouse to relieve me from having to use the trackpad on my new laptop. Upon turning on the device, turning it on (it has its own power switch to conserve the battery), and pluggling the wireless transceiver into a USB port, Windows 7 recognized it immediately and downloaded the most current software for it. A configuration screen came up, I accepted the defaults, and it was ready to go. It had no problem tracking on the surface I was using, though I did not throw much of a challenge at it. There was never any loss of connection. The transceiver is suitably small, which made it possible to keep plugged into the laptop even when it was being stowed in a bag.
Unfortunately for me, I have larger than average hands, and this mouse seemed to me to be very small. My hand did not cup it comfortably, and I have used generic, non-ergonomic wired mice the fit my palm much better than this device. In fact, I found myself tending to use the trackpad instead of the mouse (perhaps out of habit, but I also ended up preferring the pad to this mouse).
Moreover, the mouse wheel was extremely stiff and difficult to scroll. I had to put so much force into scrolling the wheel that I often ended up clicking it on accident, which of course resulted in the mouse performing actions I did not want.
I am returning this mouse and hoping to find a larger one with a mouse wheel that turns more smoothly.