Chinese government regulators have made visits to multiple Microsoft offices in Beijing, Shanghai, Guangzhou and Chengdu, but it's unclear what investigators were looking for.
A Microsoft spokeswoman confirmed the visits, but didn't give a reason for the inspections. Reports of the sudden visits, or raids, were reported in the South China Morning Post and Reuters.
Microsoft and the Chinese government have had their run-ins of late due to the end of support for Windows XP as well as the Edward Snowden revelations about the NSA. The Snowden fallout has hurt business for many U.S. companies operating in China. Meanwhile, Chinese regulators are also looking into Qualcomm's business practices.
The State Administration for Industry and Commerce sent investigators to the Microsoft offices. Microsoft is cooperating.
The South China Morning Post noted that the Chinese government has been worried about Windows 8 security as well as pricing.