La gratuité confirmée :
Delivering Windows as a Service and a Free Upgrade to Windows 10
Today was a monumental day for us on the Windows team because we shared our desire to redefine the relationship we have with you – our customers. We announced that a free upgrade for Windows 10 will be made available to customers running Windows 7, Windows 8.1, and Windows Phone 8.1 who upgrade in the first year after launch.
This is more than a one-time upgrade: once a Windows device is upgraded to Windows 10, we will continue to keep it current for the supported lifetime of the device – at no additional charge.
http://blogs.windows.com/bloggingwind ... C_W10BLOG&linkId=11873428
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