Microsoft has been slapped with a patent infringement lawsuit over its use of dynamic “live” tile icons in Windows, including in the newly launched Windows 8 OS for PCs and tablets and in the Windows Phone 8 OS for smartphones. SurfCast takes issue with Windows’ use of live tiles, which are rectangular or square icons in the Start screen of new Windows versions that provide links to applications, websites, contacts and other elements. SurfCast describes itself on its website as a designer of OS technology. It claims to have developed the live tile technology in the 1990s. Live tiles are a key user interface feature in a variety of new Windows versions, including Windows 8, Windows 8 Pro, Windows Phone 8 and Windows RT, which is a Windows 8 version for devices that use ARM chips. Microsoft first used live tiles in Windows Phone 7.