All you have to do is fax them the following: (716-447-7330)
Fax Cover Sheet:
1) To: Microsoft Supplemental Parts
2) your first & last name
4) telephone number
5) email address
6) photocopy of the bottom of your mouse, with a setting clear and light enough to show the Product ID information on the mouse.
You often get a better Mouse than the one you “lost”. The very first “Intellimouse” wheel mice had a lifetime warranty (recent one have a shorter warranty). I sent in an original Intellimouse and got back a new optical model.
Somewhere on the Microsoft site is a page that lists the warranty duration for their hardware.
Incidentally, if you are curious how old your Microsoft rodent is, on the label,there is a manufacturing date code on the bottom label. Look near the Product ID for a 4 digit #, often in different looking print, like 0205 or 4201. The last two digits are the year and the first two are the week, so 42nd week of 2001 for the latter date code.
(That happens to be the date code on the Intellimouse I am using now. I bought 24 of them for work for $2.00 each about 3 years ago and am still working through the pile.)
Update: All you need to do now is call 1-(800)-360-7561 and speak with someone about replacing your mouse. Tell them that your intellimouse is broken, and give them the PID of it. They will send you a new one, as in the new 3.0 intellimouse, no questions asked. It worked for me! I got my new intellimouse via UPS 2 days after I called.