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Window 10 S devices can be upgraded to Windows 10 Pro for $49
Microsoft's latest operation system, Windows 10 S, is designed for the education market with a variety of supported devices starting at $189. (PC makers like Acer and HP started advertising their Windows 10 S laptops shortly after the official announcement.) Those who aren't in the education market but want to try out these devices anyway, Microsoft says you'll be able to upgrade to Windows 10 Pro for $49.
The $49 will be a one-time fee, and once you've upgraded to Windows 10 Pro you won't be able to return to Windows 10 S. Students, teachers, and school administrators can upgrade the Surface Laptop for free, but only until the end of 2017. There appears to be no option to upgrade to Windows 10 Home.
For devices like a $299 HP ProBook, the $49 upgrade charge is a nominal fee to bump up to a fuller version of Windows. But for those shelling out $999 for a Windows 10 S Surface Laptop only to drop another $50 to upgrade, that pricing scheme appears to be a bit of nickel and diming. Or maybe it's worth the extra bucks to get an OS that matches the hardware. Either way, it's available if you want it.