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This release introduces media queries into Adaptivetheme and an entirely new layout system which allows you to configure layouts by device and screen size. Both responsive and adaptive type layouts are supported by the Adaptivetheme.
NOTE: Be extremely careful about simply upgrading to this version - while the normal desktop version of your site may run and look just fine you may need to make CSS changes or other changes to the mobile and tablet layouts to accommodate your site. It would pay to check the layout settings, and if possible check your site in different devices.