Chinese officials recently showed up unannounced at four Microsoft offices in China, reportedly to investigate antitrust accusations.
According to the South China Morning Post, State Administration for Industry and Commerce officials arrived in Beijing, Shanghai, Guangzhou, and Chengdu.
It's unclear exactly what they are investigating. When asked for comment, a Microsoft spokeswoman said "we aim to build products that deliver the features, security and reliability customers expect, and we will address any concerns the government may have."
The news comes about two months after China reportedly banned Redmond's latest OS on government computers. All desktops, laptops, and tablets used by central state agencies must run on an OS other than Windows 8, according to China's Central Government Procurement Center.
The center did not specify why it was banning Windows 8, but the Xinhua news agency said the country wants to avoid losing support for an operating system like it did recently with Windows XP.
China also recently took aim at Apple and the location tracking on its iPhone, which the country said was a national security issue. Apple denied it.
But while Windows 8 may be under suspicion, Microsoft's Xbox One will arrive in China this September, the first console to be sold in the region in over a decade. Retailers like JD.com are taking pre-orders now, according to Bloomberg. They are requiring an $81 deposit, but JD.com declined to say how much the console will cost Chinese consumers in total.