That should­n’t be worth post­ing about, but it took more work than it should have. Sum­ma­ry: I prob­a­bly should have stuck with Log­itech wire­less keyboard/mouse com­bi­na­tions, because I did­n’t have a prob­lem with the pre­vi­ous set I had and nev­er had occa­sion to call their tech­ni­cal sup­port. But since I bought a Microsoft prod­uct, it was worth­while to hound them until they came through on their war­ran­ty, despite the fact that the expe­ri­ence was some­what painful.