Microsoft 'Under Investigation' In China
Microsoft's China offices have been subjected to unexpected visits from state officials as part of a reported "investigation" into its affairs.
The world's largest software company did not give a reason for the visits, but said it was "happy to answer the government's questions".
China's state administration for industry and commerce sent its investigators to the company's offices in Beijing, Shanghai, Guangzhou and Chengdu as part of an official probe, the South China Morning Post reported.
A Microsoft spokesman said: "We aim to build products that deliver the features, security and reliability customers expect and we're happy to answer the government's questions."
The firm has been the focus of anti-US technology sentiment in the country following the revelation of NSA spying programmes by whistleblower Edward Snowden.
Microsoft's relationship with China has been rocky - in May government offices were banned from installing Windows 8, the latest Microsoft operating system.
Earlier this month, Microsoft's OneDrive cloud storage service was reportedly disrupted.
And state media has previously demanded "severe punishment" against American technology companies for allegedly helping the US government to steal secrets and monitor China.