Microsoft warranty on their mice?

Several times I've come across references to Microsoft offering a
(unofficial?) lifetime warranty on their mice. If this is true it
would be very nice for me; I have a couple of high-end dead Microsoft
mice I bought several years ago (a wireless intellimouse explorer and
a intellimouse explorer 3). Using Microsoft Canada support gets me
nowhere because it does not accept the Product IDs I have on the
bottom of the mice. Should I dump dead mice in the garbage or is there
still some value to them? Thanks.