Among 638 Chinese companies surveyed by the Chinese government, 85% of all computer systems were found to be running some version of Windows. By comparison, 10% of systems run some flavour of Unix, 3% run Linux and 1% run Mac OS.
The companies covered by the survey included many of China's most important companies across 33 industrial sectors, including aviation, telecommunication, electronics and finance.
The results of the official survey come one month after Microsoft lost out on a high-profile tender for desktop software put forward by the Beijing municipal government. Instead of selecting software from Microsoft, the Beijing government chose software from six Chinese software companies, including Linux developer Red Flag Software.
While analysts and other industry pundits have often spoke of the rapid growth and vast potential for Linux in China - and the possible threat to Microsoft's business - the survey reflects just how deeply entrenched Microsoft Windows has become in the country's commercial sector.