Microsoft trying to prevent Acer and Asus from adopting Android through royalty fees
HTC is the only Taiwanese high-tech vendor to have a license for using Microsoft products, but nevertheless Acer and Asus are also known to use e-mail, multimedia and some other functions patented by Microsoft. That leaves the door wide-open for Microsoft to charge royalty fees. According to the rumour that "pursuit of justice" is primarily driven by Microsoft's desire not to allow the above-mentioned Taiwan-based manufacturers to adopt Android for their netbooks and tablet PCs.
Since Acer and Asus' handsets are not the most-popular on the market, Microsoft won't seek royalty charge based on revenue but rather the Redmond-based giant will concentrate on finding ways to make their market share bigger and increase the popularity of their devices on global scale.