Barnes & Noble has quietly taken its allegations of Microsoft antitrust abuse to a formal level, according to newly-publicized documents. The company is now known to have sent a letter to the Department of Justice's chief competition counsel Gene Kimmelman on October 17 claiming that Microsoft's anti-Android patent licensing campaign was meant to artificially "drive out competition" and make companies choose Windows-based platforms. It contended that Microsoft's lawsuit against Barnes & Noble, Foxconn, and Inventec was more to silence competition from the Nook and o