Microsoft sent out invitations to a September 30 event at which it is expected to provide a glimpse at the next version of its Windows operating system.
Beijing summoned the US ambassador and accused Washington of double standards Tuesday over its unprecedented indictment of five Chinese military officers for cyber-espionage.
Microsoft was scrambling Sunday to repair a security hole in its widely used Internet Explorer web browser, saying it had detected attempts to exploit the flaw.
Microsoft on Wednesday courted application makers with a "re-blended" version of the overhauled Windows 8 operating system released late last year.
Microsoft kicked off sales of its revamped Windows 8 system and Surface tablet Friday amid mixed reviews as the tech giant ramped up efforts to compete in a market shifting rapidly from PCs to mobile devices.