Windows 10, the next version of Microsoft’s operating system, is already available as a “preview” version (understand beta) and can be downloaded for free.
This version offered free of charge by Microsoft is in beta. Save your data! Once the migration is done, you will probably no longer be able to go back unless you perform a complete reformatting of the disk. Be sure of what you're doing!
The product key to use when installing:
Download Windows 10 Insider Preview
Note that the final version will be offered free of charge to all users with a Windows 7 or Windows 8/8.1 license in the first year of commercialisation.
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