Lumia owners, both from Nokia and Microsoft, your days are numbered. At least if you're still running Windows Phone 8.1. It might be a shock to some that that version of Microsoft's defunct mobile OS still exists and still runs. It might not be a shock, however, to hear that Microsoft is pulling the plug on it this year. Fortunately, Redmond has a bit of mercy and a path forward for the few still holding on to some of these phones for dear life.