installation instructions?

There are just 3 steps: 1) put in a AA battery / 2) turn on mouse via the switch on the bottom of the mouse / 3) insert the nano-receiver into an open USB port on your computer. If your computer happens to not auto-install the driver (I know Vista & Win7 did for me), you should go to the downloads area of the hardware section on the Microsoft site.

what function is the side button for?

There are actually 2 side buttons. By default, one is for "back" (previous page) and one for "forward". These are mostly used while browsing web pages, but some other apps support those buttons. The buttons can be assigned to other functions, but I find back and forward to be quite useful, so I haven't change them.

I have a Microsoft Wireless Desktop Receiver 3.1 for Keyboard and mouse. Will this mouse work with it (Microsoft Wireless Mobile Mouse 4000)?

No. Receivers are hard keyed to the keyboard and mouse they were included with.

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Microsoft Wireless Mobile Mouse 4000 for Business

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4 Buttons Tilt Wheel
USB 2.4 GHz RF
BlueTrack

Overview

Specs

Reviews (75)

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Microsoft Wireless Mobile Mouse 4000 for Business, USB Port, English, Brazilian, French, Spanish, 1 License For Business, Black. Ships in a brown corrugated box as a single unit and is not intended for retail shelf display.

Model
Brand	Microsoft
Name	Wireless Mobile Mouse 4000 for Business
Model	4DH-00001
Type	RF Wireless

Wireless
Power Supply	1 AA alkaline battery required (included)
Operating Time	Up to 10 months
Distance	15 feet (5 meters) typical

Details
Interface	USB
Tracking Method	BlueTrack
Buttons	4
Scrolling Capability	Tilt Wheel
Color	Black
Resolution (DPI)	1000 dpi
Version	RF Wireless

OS / System Requirement
System Requirement	Requires a PC that meets the requirements for and has installed one of these operating systems: Microsoft Windows 8.1, Windows 8, Windows 7 Hard Drive: 100 MB Other CD-ROM USB 1 AA alkaline battery required (included)

Features
Features	BlueTrack Technology Take advantage of BlueTrack Technology, which combines the power of optical with the precision of laser for remarkable tracking on virtually any surface. Plug-And-Go Nano Transceiver Leave the nano transceiver plugged in when you're on the go, or stow it in the mouse. Reliable 2.4-GHz Wireless Enjoy the 2.4-gigahertz (GHz) wireless technology, which delivers a reliable connection with up to a 15-foot range, with virtually no interference. Up to 10-Month Battery life Use your mouse for up to 10 months without having to change batteries. Battery status indicator tells you when battery power is low. Flip 3D in Windows 7 Easily switch between open windows with the click of a button. Four-Way Scrolling Scroll four ways for greater efficiency and comfort with Tilt Wheel Technology. Four Customizable Buttons Get quick access to the media, programs, and files you use most often.

Additional Information
Date First Available	June 14, 2011

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Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years
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Return for replacement within: 30 days

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Microsoft Wireless Mobile Mouse 4000 for Business

Learn more about the Wireless Mobile Mouse 4000 for Business

Customer Reviews of Wireless Mobile Mouse 4000 for Business

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

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Manufacturer Contact Info

Item#: N82E16826105450

Microsoft Wireless Mobile Mouse 4000 for Business

Learn more about the Wireless Mobile Mouse 4000 for Business

Customer Reviews of Wireless Mobile Mouse 4000 for Business

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info