The software maker says that an investigation shows that the Juku microblogging application on MSN China did swipe code from a rival.
A microblogging site whose code was copied for use on MSN China indicates that Microsoft's apology isn't sufficient to settle the matter.
Microblogging service Plurk says a service Microsoft recently launched in China "rips off" its user interface as well as 80 percent of the underlying code.
The software maker says it is still investigating allegations that MSN China's Juku microblogging site improperly uses code from a rival service.
Company issues statement saying it's looking further into allegations that it used a rival's code and design for a microblogging service in China.
Microsoft and Intel focus on antitrust issues, while Microsoft shutters site over code theft. Also: the Google phone.