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SHANGHAI (Reuters) China industry and commerce regulator has asked Microsoft Corp to explain "major issues" that it says have come to light from digital data obtained as part of an anti trust investigation. software titan over its Windows operating system launched in mid 2014.

The company must submit a complete explanation following the inquiry, the SAIC said in a statement posted on its website. SAIC was not immediately available to comment.

The SAIC move,Reusable Spo2 Sensorscoming more than a year after the investigations were first launched, could signal new uncertainties for Microsoft in China as it attempts to boost business in the world second largest economy.

"We serious about complying with China laws and committed to addressing SAIC questions and concerns," a Microsoft spokesman said.

When the case was launched, the SAIC said Microsoft had not fully disclosed information about Windows and its Office software suite. The SAIC was also investigating a Microsoft vice president and senior managers.

In raids on company sites in Beijing, Shanghai, Guangzhou and Chengdu the SAIC collected a trove of documents, emails and other data, it said at the time.