Rating: 
Summary: Not really Bluetooth compatable
Review: I purchased this mouse for use with my Dell laptop, a Latitude D600 with built-in Bluetooth support. The mouse came with a little Bluetooth dongle for the USB port, but I figured, "Hey, it's Bluetooth, that's a standard, it'll work". Turns out that this mouse's implimentation of Bluetooth is totally proprietery and it can only work with it's paired dongle. Heck, I can buy a proprietary wireless mouse from Targus or whoever for far less money, the point of Bluetooth is compatability.I returned it for a refund after the Microsoft support team confirmed that indeed it would not work, and was only compatable with it's proprietary "Bluetooth"-ish interface dongle.
Rating: 
Summary: Decent mouse, but could use some updates
Review: I purchased this mouse locally, since I needed a bluetooth adapter and wireless mouse. I was told it would work with my G4 Powerbook. It set up flawlessly and I had it working within 1 min with OS 10.3 (Panther). I was impressed that the mouse set up so easily. The BT adapter also works with my Palm, but required a little more tinkering. While the left, right and scroll buttons worked fine, I was unable to program the other two buttons (Mac). This mouse is rather large relative to most mice. Since there is no on-off switch, I am concerned about battery life (other reviews report short battery life) but haven't owned it long enough to know. If my Mac goes to sleep, the mouse won't wake it up, as it too is sleeping. Sometimes there is a lag in the mouse cursor, which is disconcerting coming from a wired mouse. All in all, a decent product, but for its shortcomings, I'm not sure its worth $80. Maybe the next version will correct some of these faults. Pros: bluetooth and wireless, ergonomic, includes BT adapter, works with Palm Tungsten PDA for synchronization, 3/5 buttons work with Mac. Cons: a bit pricy ($79), rather large, no "off" switch, not rechargable, short lag in mouse movement, can't program 2/5 switches.
Rating: 
Summary: With Dell Latitude D600
Review: I purchased this mouse to use with a Dell Latitude D600 laptop with integrated bluetooth. Taking just the mouse, I put batteries in it and used the Dell software to recognize the mouse. It took about 10 seconds, and the mouse was working. You do not need the other parts of the package, but I did later install the software that came on CD with the mouse to increase functionality. Note that this mouse runs on two AA batteries and there is not an on/off switch. It reduces its power levels after it has not been used for a time, but purchasers should be aware that there is no way to switch it off when travelling, for example (when movement in a bag etc. is likely to make it power up). Like all optical mice, it emits a red light from the bottom. This light is constant as you use the mouse, then blinks fast after a period of disuse, and then blinks slowly after an extended period of not being used. But it never shuts off unless you remove the batteries. Although I do not yet have experience with it, the batteries are likely to be used up more quickly if the mouse is moved or travels, rather than while sitting on a mouse pad (because the mouse jiggling around in a bag will cause the optical eye to emit more light, as if you were using the mouse). A final note, the door for the batteries has a latching mechanism that doesn't appear to me to be particularly strong (it is plastic). I feel the latch is likely to break with repeated battery changes. Ergonomically the mouse is the most comfortable I have ever used, though somewhat larger than most mice and a bit of a mismatch (size wise) for a small laptop computer.
Rating:
Summary: Not Bad, But Will It Stand Up To Constant Use?
Review: I received this as a Christmas gift from a tech-savvy family member. After the initial shock ("Why the heck would you give me a computer mouse for Christmas???") I found that enjoyed having an ergonomic mouse and the extra buttons, and since it's wireless it was a lot more convenient than my old PS/2 mouse with its cord that never quite reached the right-hand side of my desk. However, this thing really goes through batteries. I finally got a package of 4 NiMH batteries and a charger because I was going through the alkaline batteries so fast. Because of the frequent battery changes, I am concerned that one day the battery compartment door or the contacts inside are just going to give out me. And that old PS/2 mouse? I have to keep it plugged in as a backup because the connection with my wireless one is so touchy.
Rating: 
Summary: Stopped working and generally caused problems
Review: I set this mouse up with my internal bluetooth and it was working fine until I downloaded Service Pack 2 for Windows XP. After that I could never get it to work again without plugging in the bluetooth receiver that came with it.
It did suck batteries but I have rechargeables so that didn't bother me so much. The lack of an on/off switch is very annoying if you transport it with you. I carry my laptop to school so I found that the constant motion meant the mouse was constantly working and using batteries. Also, the mouse was too big to carry easily.
I ended up returning the mouse and ordering a Bluetake BT500 bluetooth mouse instead. (You can order from newegg.com.) It's tiny, has an on/off switch, and works much better for me. (I had to reinstall the drivers for my internal bluetooth to get it to work though. Seems that Service Pack 2 messed it up.)
I would only recommend the Microsoft bluetooth mouse if you want a bluetooth for your home computer (so you won't be transporting it and won't mind the size--because it is comfortable under your hand) and your computer doesn't already have a bluetooth receiver.
Rating:
Summary: why no off button?
Review: I'm giving up on this mouse, 'cause it eats batteries, and the manufacturer specs warn against using recharables. I've used it for about 6 months, and battery changing has gotten too tedious. After about 10 days, it starts to loose the bluetooth connection.
Ergonomics were okay, though if you are using it with a laptop, you might want something smaller.
Simply adding a power switch, so one could turn it off at the end of the day, would have a been a great feature.
Rating:
Summary: Worked great for me
Review: I'm using this mouse wit hthe built in bluetooth on my Dell Inspiron 600m and have had none of the problems listed in many other reviews. As usual, the Microsoft software bundled with the mouse proves to be slightly invasive and could be very confusing for most users. After initially trying to install the software with much confusion, I just decided to not use it at all. With any bluetooth receiver installed on your computer, you should be able to "discover" the mouse under My Bluetooth Places, pair the mouse, and enjoy. The default Windows XP mouse drivers allow for functionality of most mouse features without any of the additional microsoft software. I would imagine that any Microsoft "intellimouse" software would activate the bells and whistles of the mouse. The software included with this mouse seems to be centered around the bluetooth receiver instead of the mouse. If you're not using the Microsoft Bluetooth receiver, I'd just leave the installation disk in the box...
Rating: 
Summary: I love this mouse
Review: I've used a variety of different mice over the years including a previous wireless mouse. This is the best! Its expensive, but well worth the money since its loaded with features. The wireless connection is so good that there is no indication that the mouse isn't directly connected by wire. Tracking is smooth and precise. Very confortable and ergonomic. I've been using it for nearly 8 months now without a single problem. Two AA batteries last me about 4 weeks with continuous daily use.
Rating:
Summary: somewhat mediocre
Review: if you are thinking of purchasing this mouse, wait until microsoft comes out with the next generation of this model. the nuances and little bugs probably will be cleared by the time they make a new one. this being the first one, it seems like it was rushed. it's an alright mouse, but here are my problems:
1. the one that annoyed me the most was the fact that the mouse was uneven. the upper-left and bottom-right mice feet seemed to be thicker than the other two, so i spent a couple hours or so sanding those two down to make the mouse level. $80 mouse and i'm sanding its feet down so it's level for christ's sake? hmm..
2. i pretty much waited until the batteries went out the first time after about 1 and a half weeks of use. then the batteries went out, so i put some new ones in, and all hell broke loose. the thing would not connect at all, and after reinstalling bluetooth over and over again i gave up. then i reformatted my computer. then reinstalled, and it worked. the batteries are once again low, and if i have to reformat my hard drive again just to get this thing to work, it's going in the trash along with eighty dollars.
3. if you are into gaming - do not get a wireless mouse. the precision is something to be desired, but this is true for any wireless. get a a mouse with a cord if you are a gamer. right now i'm using 2 mice. one old optical cord mouse for gaming, and this bluetooth microsoft for browsing and other miscellaneous computer usage.
all in all i would say do not get this mouse. wait til the next generation comes out. i really like the ergonomics of the mouse, the feel is great, i like the placing of the buttons, and they all work fine. the color is also beautiful. but i'm assuming when the next generation comes out it will have an on/off switch to save batteries at night (the darn thing is on even when the computer is off, eating away at battery life.) also i'm sure the problem with the BT getting confused when you put new batteries in will be fixed.
Do not get this mouse! Wait until the next generation comes out! there are too many bugs to make it worth the money.
Rating:
Summary: IBM T40 Installation Without Microsoft SuppliedTranceiver
Review: In response to "R.W. Elliot"'s review with this mouse on the Thinkpad T40... I also was forced to uninstall the Thinkpad's Ultranav driver. After the MS mouse was working, I quickly re-installed the Ultranav driver, and have been running all three devices (the Synaptics touchpad, IBM built-in trackpoint, and this Bluetooth mouse) concurrently. It is very easy to re-install the Ultranav driver (I already had it downloaded from the ibm.com support site), and it is mind-boggling why the Microsoft mouse installer requires it to be removed...
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