In a new IEBlog post, Microsoft talk about how the internet will be transitioning to a plugin-free web, where websites will no longer require plugins to be used. Unfortunatly, today is not that day and millions upon millions of websites still use plugins. The Metro version of IE10 will not support plugins, but will ask if you want to switch between desktop and metro mode when plugins are needed.

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Read more http://www.winbeta.org/news/metro-ie10-will-warn-you-when-you-visit-site-requires-plugins-will-offer-switch-desktop-mode