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Yet another critic has stepped up to call Microsoft’s still-fresh Windows 8 operating system a usability nightmare, saying it is “a monster that terrorizes poor office workers and strangles their productivity.”

Jakob Nielsen, one of the world’s foremost web usability experts, slammed Windows 8 in a lengthy blog post today. He calls out the OS for hiding features, reducing discoverability, low information density in “Modern” apps, overly active live tiles, and overall reduced power using a single-window interface.