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Microsoft Corp. is working on a "service in the sky" for unified communications, an executive said Tuesday at the VoiceCon conference in San Francisco.

The company's current focus for the fast-growing trend of combining voice, video, text and other forms of communication is Office Communications Server 2007, which Microsoft said it will unveil Oct. 16 at a San Francisco event featuring Chairman and Chief Software Architect Bill Gates. But at the same time, it is working on providing these capabilities as a service, said Warren Barkley, a principal group program manager at Microsoft. He mentioned the project in passing at the end of an early-morning panel session at VoiceCon. He didn't give a timeline for availability.