I saw this on Anandtech forums here: The Skinny: Replace your Microsoft mouse (intellimouse, wireless, usb, ps2, whatever) for FREE. Note: ONLY on RETAIL (OEM will just be rejected) *** YOU DO NOT NEED TO SUPPLY YOUR SALES RECEIPT, RETURN YOUR OLD MOUSE, OR PAY ANY SHIPPING CHARGES. *** Note: Refer to the warranty or call the toll free number if you have any questions about Microsoft's policy. Below I'll outline the information given to me over the phone by a Microsoft Supplemental Parts rep. If you call Microsoft Supplemental Parts (800-360-7561 toll free USA & Canada) they will give you a fax (716-447-7330). All you have to do is fax them the following: 1) To: Microsoft Supplemental Parts (<- rep said this was important) 2) your first & last name 3) address 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. I'm going to give it a try with my aging Intellimouse Explorer 3.0, having some double click issues... Also I think that you don't actually have to fax anything, just tell them you don't have a fax machine and they will take your info (so I hear).