The European Commission and Microsoft have been tangled in a long and drawn out legal battle that has now spanned almost 20 years. The EC reacted to accusations that the software giant was using its position as market leader to stifle competition by leveraging a $1.1 billion fine on the company. In a related case it also ruled that Microsoft should include a "browser ballot" with its operating systems. Now, a new dispute appears to be brewing, once again hinging on browser choice in Microsoft's OSes. The Redmond-based company failed to include the required ballot screen with its Windows 7 Service Pack 1 update, and has also drawn criticism for preventing browser choice with its upcoming ARM-based operating system, Windows RT.