It seems really easy to get a Microsoft mouse. I don't have any Microsoft mouses though. I do have a Logitech Cordless Mouseman Optical and I complained to logitech that my mouse was eating up batteries too fast, such as once every 1 or 2 weeks. Their process was basically the same for a replacement. They had me fax in the bottom of my mouse where the serial was and my proof of purchase. The funny thing was, the serial number whitens out from usage! Well if these input manufacturers wisen up, they could place the serial information on the other side of the battery cover and the serial wouldn't be rubbing against the surface all the time. Anyhow I faxed them the bottom of my mouse.. all white and faded and they sent me a new mouse. It ate up batteries even quicker! Oh well, all I can say is Microsoft and Logitech have good customer service for their input devices. Regarding their technical abilities to solve issues, I don't know. My second mouse has a faded bottom too where the serial used to be also by the way...