Microsoft has launched two pioneering copyright lawsuits in China in an attempt to deal with the problem of rampant software piracy. The cases were filed against Shanghai Gome, a branch of one of China's largest retailers, and Beijing Chaoyang Buynow, a shopping mall in, respectively, Shanghai Huangpu District People's Court and Beijing No 2 Intermediate People's Court. Microsoft claimed that it had evidence of pirated copies of Microsoft Windows and Microsoft Office being pre-installed in computers sold by Shanghai Gome and by two of the retailers in the Buynow shopping mall. The filing against the Beijing shopping mall is the first time the principle of landlord liability has been applied to copyright infringement in China. If successful, it could lead to a series of similar cases. The US software company has had some notable successes in the last few years in its attempts to crack down on piracy, including sending 11 people to jail after a decision by a court in Shenzhen in January 2009 in a case that involved what the company called the biggest counterfeiting operation it had ever seen.