Alibaba and Yahoo China real name service subsidiary 3721 is encouraging its users to upgrade to the latest version of its software. According to CNet China, the new 3721 version prevents normal operations of Chinese forum content aggregator and search provider Qihoo's free anti-virus software "360 Safe". Qihoo cooperated with Russian anti-virus software vendor Kaspersky for 360 Safe and has labeled more than 200 products as spyware, including 3721's software.