I have 7 in both machines, and I know of no one, not even in my computer club, who uses 8 or 8.1. Is it worth dual-booting one of them in 8 in case the site where I work requires a newer OS, or is it a disaster like 10? Not moving to 10 at all, not wiling to go through that agony before I toss the machine through the (real) window.