As a temporary fix until Bootcamp 3 comes out. These instruction are written for Windows 7. I haven't tested this with other versions of Windows.
1. Head to this site, download and install the correct driver for your OS (32-bit or 64-bit)
http://uneasysilence.com/archive/2009/11/14588/.
2. After intall, turn on your your Magic Mouse
3. Left click on Bluetooth Device icon in System Tray
4. Select Add Device
5. In the Add Device window, right click on your mouse and select properties
6. Under the Services Tab, check "Drivers for keyboard, mice, etc (HID)"
7. Click Apply
8. Installing Device Driver should popup showing Apple Wireless Mouse
It should now show up under Devices and Printers as a Apple Wireless Mouse.
Update: 2 issues to mention.
1. Horizontal and Vertical scrolling work great! Two finger swipes don't seem to work.
2. Just so you know, the Magic Mouse has a tendency of falling asleep if the mouse is inactive for more than 30 seconds. All it takes to wake it up is to move the mouse a bit or click a button. It can be a bit annoying if you tend to take your hand off the mouse quite a bit to do some typing. You will notice a lag as you move your mouse for the first time after it falls asleep, but will quickly catch up and track correctly after it wakes up, which only takes a split second.
Message was edited by: psyrendust
Message was edited by: psyrendust