Microsoft executives revealed that the first Nokia handset running Windows Mobile will be unveiled next week, and talked up the company’s mobile OS compared to Google’s Android.

The first devices to emerge from the Nokia and Microsoft tie-up announced in February this year will be announced at the Nokia World event in London next week, according to comments made by Microsoft CEO Steve Ballmer and President of Windows Phone Andy Lees.

Ballmer revealed that Nokia will unveil “a bunch” of new Windows Phone when speaking at the Web 2.0 conference in San Francisco, reports consumer tech publication BGR.

Lees also indicated that this would be the case while speaking at the AsiaD conference in Hong Kong, reports Engadget. "Nokia will announce its rollout plans with Windows Phone, among other things. It made an evaluation early on, and saw our roadmap for this year and next year, and it decided to bet the whole company on Windows Phone based on that,” Lees was quoted as saying.

The long-term plan is for Nokia to move towards Windows Phone as its primary OS for its smartphones.

Mobile Business Briefing will be reporting live from Nokia World next week and will bring you all the immediate news.

Meanwhile, Ballmer took a swipe at Android during an on-stage interview in San Francisco, suggesting Google’s technology is more complicated to use than Windows Phone. “You don’t need to be a computer scientist to use a Windows Phone, but I think you do to use an Android phone,” Ballmer reportedly said.

Lees added that Android is “very techy” compared to the “people approach” of Windows Phone 7, according to Engadget.

Lees also claimed that Windows Phone 7 enjoyed better sales in its first year than Google’s Android did in its debut year. However there were far fewer devices running Android during its first year of availability than have been available for Windows Phone 7.

Microsoft has so far been coy about revealing figures about the uptake of Windows Phone 7, although Ballmer has previously suggested that sales have been below expectations. Recent estimates suggest Microsoft’s smartphone market share declined in Q2 2011, with Gartner estimating that 1.7 million Windows Phone devices were sold during the period, a 1.6 percent market share.

Google this week announced that the next version of Android, Ice Cream Sandwich (Android 4.0), will be launched on the Samsung Galaxy Nexus device in November.