Summary: Replaced Microsoft 7000 wireless keyboard and mouse with the logitech MK710 combo because the Microsoft 7000 USB transmitter part failed. Since I learned there are no replacements available for that part, it all has to be scrapped. No more MS hardware!!! Unlike Microsoft, Logitech's USB transmitter part is common for different keyboard and mouse components - and it can be purchased separately. No problems installing The MK710 combo and both keyboard and mouse work great.