Windows 10
Noteably, the best version of Windows yet. It's the safest and easiest to use Windows. Some of my favorite features are:
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Speech Recognition
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Cortana
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Windows Hello
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Microsoft Edge
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Saving and syncing content
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Microsoft Solitare Collection
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Microsoft Suduko

Windows 10 – Free Upgrade from Microsoft until Jul 29 2016
Don't want the upgrade? Turn off the Recommended Update Setting