Dave, to continue with the hijacking of Antony’s thread (sorry Antony, but it was started due to concern for your wellbeing), is the Logitech mouse you mention a ‘vertical’ mouse? It looks like it, but it can be difficult to tell. I think these are really great for avoiding muscle/tendon problems. I have three mice on my desk, each able to control either the Mac or Windows computer so one would be enough, but I can’t decide which I prefer. If the Logitech mouse is similar (vertical) to what’s currently my favourite, then I might buy one. I recently bought a posh Logitch mouse, which looked ‘vertical’ but wasn’t (but it’s one of the three in use).