The effects of a free upgrade to Windows 10 are starting to trickle in. Available for just over a month, Windows 10 has now captured more than 5 percent market share, according to the latest figures from Net Applications. In just four weeks, Windows 10 has already been installed on over 75 million PCs. Microsoft is aiming to have 1 billion devices running Windows 10 "in two to three years," though that includes not just PCs, but smartphones, consoles, and other devices as well.

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