I have had a MS Bluetooth mouse for months, attempting to use it with my new IBM T41 laptop which has built-in Bluetooth support (integrated transceiver, antenna in lid). I've been waiting like everyone else for SP2 so the Bluetooth mouse support in Intellipoint 5.2 could be enabled. Finally, I was able to install SP2, I reinstalled Intellimouse 5.2 and still no button assignment possibility. I find that all of the buttons function, but only in their default mode. To be specific, I told Intellipoint 5.2 to assign Double-Click to the wheel (center) button, Show/Hide Desktop to the large thumb button and Back to the small thumb button. All of these are ignored. At first, I thought there was a problem with the codes the mouse was sending, but then I discovered that the thumb buttons do work as Back and Forward, their default settings. Oddly, the wheel button appears to be assigned to Auto Scroll; in any case, I can't override this, either. So, then, the buttons work fine. The signals are being transmitted just fine to the laptop's built-in Bluetooth transceiver. These signals are getting to the mouse driver and are being interpreted properly. It's just that my settings for these buttons are not being honored. If anyone has a clue as to how to solve this, please respond. For as much as I like the feel of this mouse and the lack of a tether, I cannot use it comfortably without my preferred buttons and have gone back to using an old, wired Intellimouse Explorer. Thanks in advance for any help or advice.