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The competition between Qihoo360 and Tencent QQ, also called as 3Q battle, is the competition between two of the biggest Chinese Internet Qihoo and Tencent. In this competition, Qihoo and Tencent criticized each other for unfair competition. Qihoo released a software called 360 Privacy Guard at September 2010, aiming at a famous iM software Tencent QQ, claiming it could protect the privacy and network security of users of QQ. As a fight back, Tencent announced that QQ will not work on a personal compute that installed any software from Qihoo. This competition practices that has escalated in November 2010, and hundreds of millions of users were forced to choose sides in the dispute.

This competition involves the competition between Qihoo and its other competitors, such as the competition between 360 Safe Browser and Sougou Brower. Because of the competition, a number of Chinese Internet companies, such as Kingsoft, Conew and Baidu announced that their software would no longer compatible with softwares from 360.

This competition ends with the involvement of local government. Local government instructed Tencent to stop the incompatibility between QQ and 360 softwares, while Qihoo recall its 360 Privacy Guard.

Qihoo360 and 360 Safe Guard
27th July,2006, Qihoo released 360 Safe Guard. Up to Jan 2010, the Daily Active Users of 360 Safe Guard reached 100 million. Up to Jun 2010, the Daily Active Users of 360 Safe Guard reached 200 million, obtained more than 50% share of Chinese Anti-virus software market.

Tencent and Tencent QQ
Tencent QQ was first released at 1992. Tencent QQ is a free multi-platforms IM software. It is also considered the IM that used by most Chinese. Mar, 2010, the peak daily active user of Tencent QQ reached 100million.

The relationship between Qihoo and other internet companies
Between Tencent: Tencent has a competitor software of 360 Safeguard called QQ Doctor. The function of QQ Doctor is very similar with 360 Safe Guard. QQ Doctor is considered No.1 competitor of 360 Safe Guard.

Between Conew: Conew was founded by a former employee of Qihoo, Fu Sheng. Fu Sheng is considered as the designer and product manager of 360 Safe Guard. 360 Safe Guard reported Conew Anti-virous as virous for no reason. This report might be the reason of the tense relationship between Conew and Qihoo.

Tencent QQ
Tencent QQ is a IM software. It obtained a dominate position at mainland China at that time.

Tencent QQ had a conflict with its users on the privacy aspect. Many internet users questioned the action of QQ on BBSs and websites. Users doubted that QQ would scan the personal files and softwares that unrelated to the software. Some users even made a opensourcing software QQ Detector to provent QQ from scanning files.

360 Privacy Protector
This is a software produced by Qihoo at September 2010. Qihoo claimed that this software could detect the behaviors that violated the privacy of users that made by any software company. Yet not long after the software released, Tencent announced that this software will only scan the files that related to Tencent QQ. What's more, even the users change any file name into 'QQ.exe', this exe file will be scaned by 360 Privacy Protector. This software was considered as the fuse that led to the Qihoo v. Tencent competition.

Prelude
In the spring festival holiday of 2010, Tencent released the software QQ Doctor, whose functions are very similar to the key software of Qihoo Safety Guard. In the meantime, Tencent put large amount of caption to promote this product. This product was considered a large potential threat to Qihoo Safety Guard.

Arise
September 2010, Tencent updated its QQ Doctor to QQ Computer Guard. Five days later, Qihoo released a product called 360 Privacy Protector, claimed that Tencent QQ was consisting scanning user's files. This software will keeping alarm users that Tencent QQ is stealing users' privacy. Yet many users found that even though they changed the name of any random file to 'QQ.exe', this software will also gave users alarm. Many users considered this behavior as slander of Tencent.

Outburst
November 11th, 2010, QQ released a notice to its users, announced that Tencent QQ will no longer compatible with any software produced by Qihoo, QQ stopped working on the computers that installed Qihoo Softwares.

At the same night, Qihoo sent a public letter that call upon all the QQ users to stop using QQ. Users have to choose from QQ between Qihoo products. As QQ and Qihoo products are all popular softwares that was using by most internet users, this competition caused large effect on internet users.

End
November 11,2010, those two companies stopped this competition under the intervention of government.

Reaction
Yu Fei, CEO of Langezhiyang International Sales Consultant Principal, speculates that the dispute is resulted from poor competitive strategy.

In a poll conducted by Sina, 1.06 million users, or 79% of the participants, agree that the two companies "care more about their business interests than about their users."

Kingsoft and Kaspersky made their security services free for one year shortly after the dispute escalated.

On November 4, 2010, the day after Tencent stopped messaging service on computers with 360 installed, TencentHolding (SEHK: 700) lost 10.6 billion HKD, or 3.1% in market capitalization, including 1.1 billion HKD for Tencent CEO Ma Huateng. Kingsoft (SEHK: 3888) jumped 17.86% and gained 784 million HKD in market cap. Another instant messaging software producer Beijing Shenzhou Taiyue Software Corp., Ltd (Shenzhou Taiyue) (SZSE: 300002) increased by 3.7%.

Maybe Microsoft's MSN is the winner. It is agreeing to integrate their products with Sina "in areas including microblogging, blogging, instant messaging, information content and mobile services."

On 10 Nov 2010, 360 Qihoo says they are going to resume their product's compatibility with QQ.