Well, I didn't read @Jody Thornton as being dismissive. Then again, @jaclaz and me are often read as agressive or provocative more often than not (when declaring that "nothing is safe", for instance), when we clearly don't want to come across in that way at all... That said, things die. If one insists in using a rotary dial phone on a land line at present, it'll still work, in the sense that it will be able to make calls and receive them, but as more and more services require one to type numbers in reply to automated menus and the interfaces used for those menus only understand tones (and the dial phone uses pulse dialing), things become progressively more cumbersome and irritating. The same applies to all material devices, like the non-SSE2 single-core processors I mentioned above. Obviously, since all software, OSes included, are immaterial devices, they could, in principle, keep on being updated indefinitely, and remain up-to date and relevant, just as @FranceBB envisaged. But that would require a commitment to good engineering practices like those that spelled the end of Digital... Why? Because that is not part of the Zeitgeist anymore (and the demise of Digital has shown that already was the case in 1998!). Sic transit gloria mundi.