Thanks for your information. My set is/was eight years old. Keyboard died from a spill two years ago. I replaced with a wired version but kept using the mouse. Recently I bought another wireless board on eBay without transceiver. Big Mistake. At
least the mouse still works, even though it's not rated for Windows 8.
I tried to buy the transceiver Tykog posted about, but it was sold out or something. The sale didn't go through. Probably just as well, given all the warnings here, but on the other hand, there's a post from someone in a large office with lots of these
sets who says the parts are interchangeable.