Sharp-eyed developers may have discovered the official name for Microsoft's much talked-about cloud operating system.

While the company has so far stuck to referring to it as Windows Cloud, CEO Steve Ballmer said last week that this would not necessarily be the final name.

And one blogger has noticed that the web site for Microsoft's Professional Developers Conference listed several cloud computing sessions under the heading "Windows Strata." Microsoft has since removed these references.

Last week, reports Cnet, Ballmer remarked: "Just as we have an operating system for the PC, for the phone, and for the server, we need a new operating system that runs in the internet. I bet we'll call it Windows something. We're going to announce it in four weeks. We might even have a trademark by then."

Microsoft is expected to reveal details of the new developer platform, along with Windows 7, at the Professional Developers' Conference on 27 October in Los Angeles. X