Windows 10 free - Sort of

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Windows 10 is going to be a free update for all computers running XP to Win 8.1. What is not being stipulated is how Microsoft is to Monetize this. The most likely outcome will be a yearly subscription. When a computer is updated the original license will be cancelled so there is no turning back. Older programs may not work on the new system so care needs to be taken before updating. The release is scheduled for the middle of 2015.