Last week, Microsoft (MSFT 0.22%) opened its third online store in China.

That's right, it's third online store. 

Even though the company maintains a namesake e-commerce channel and second online store, the Seattle-based company has opened a third one, as it trails Google's Android (GOOGL 2.48%) and Apple (AAPL 4.24%) in the mobile war.

In the video below, Fool contributor Kevin Chen explains why Microsoft made its latest move and why it didn't go with Dangdang (DANG) or Amazon China (AMZN -0.23%).