An anonymous reader shares a report: Don't let the new Windows 10 S operating system stop you from buying a Surface Laptop this year. The streamlined OS limits you to using applications that are in Microsoft's Windows Store. But, as noted in the tech specs for Microsoft's new ultraportable, if you'd rather run non-Store apps, you can switch to Windows 10 Pro for free until December 31, 2017. Once 2018 hits, the switch to Pro will cost $49. But be warned: Once you upgrade your license key, you can't go back.