Windows 10 will be a free upgrade for Windows 7, 8 and 8.1 users

[Do]

求不坑，求支持全新安装。http://thenextweb.com/microsoft/2015/01/21/windows-10-will-free-upgrade-windows-7-8-8-1-users/

[yeluozhiqiu1981]

for the first year.......

[breestealth]

@yeluozhiqiu1981 是Windows 10发布第一年内免费升级。

[yeluozhiqiu1981]

@breestealth 微软学聪明了~~~