Can you believe that Microsoft wrote the"exact verbiage" on tbeir support pages?
http://www.microsoft.com/hardware/en-ca/help/support/how-to/mouse/bluetooth
I broke the transceiever for my mouse keyboard combo a week ago. It was bent for a month but still functioned. Then it failed and I broke the weld while I tried to jiggle it around. A few people on blogs say I can get a replacement if I have my purchase slip. Other blogs say Microsoft won't replace it and that each USB transceiever is specific. Other blogs says they had to junk theirs and Logitech is the correct brand to buy.