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Scary: Windows 8 Ads
Microsoft made an interesting decision to monetize some of their pre-installed Modern (formerly Metro) apps with ads, like the Weather app, as shown above. I don't know about you, but if I paid full price to install Windows 8 on my system, the last thing I'd want to see is default Modern apps running ads! Usually, people pay to have ads removed from an application; not included. But honestly, it's not so much about these in-built ads; it's about where Microsoft might take Windows ad-based monetization from here -- perhaps in Windows 9, or beyond.
[See also: 10 epic Windows 7 pranks you absolutely must try]