Microsoft has struck back at Google's accusations that the company has - with Apple and Oracle - waged a "hostile, organized campaign" against the search giant, including joining forces to buy up patents and keep them out of Google's grasp. "Google says we bought Novell patents to keep them from Google. Really?" Microsoft General Counsel Brad Smith tweeted rhetorically. "We asked them to bid jointly with us. They said no." That drew out Microsoft corporate communications lead Frank X. Shaw, who offered Google chief legal officer David Drummond some "free advice" by posting an email exchanged between legal execs at both firms.