Windows 8.1 Professional brings together everything you do – from mobile apps for your business, to Office productivity work, to searching and browsing, to accessing all your data from anywhere. Your Windows experience works across all your devices – from the best business tablet, to a thin and light notebook, to your high-performance workstation or all-in-one, whether you are at home, in or around the office, or working on the road. And Windows takes care of the essentials – letting you manage personal devices in your organization, utilize your investments in your enterprise infrastructure, and enhancing the security of your environment. In case of any problems with key activation, please try phone activation instead