Microsoft will unveil devices running its new Windows Phone 7 operating system today at an event in New York that some experts predict will be a make-or-break product launch.

Microsoft is being quiet about the final lineup of devices that will be shown, although a spokeswoman said there will be devices shown by Microsoft with AT&T, after a press conference with Microsoft CEO Steve Ballmer and AT&T Mobility President Ralph de la Vega. And Microsoft has not restricted itself to smartphones, some observers expect more news on Microsoft's plans for tablet computers.

Device makers HTC, LG and Samsung are expected to show off their new products at the launch event. Plenty of YouTube videos have been generated showing the distinctive "hubs" and "tiles" motif that will be used to distinguish WP7 from other interfaces. One video shows the incorporation of five popular apps: Netflix, Twitter, Flixster, OpenTable and Travelocity. Another video, that shows HTC's 3D customisation of WP7, has received more than 400,000 hits on YouTube.

Analysts say Microsoft's success with Windows Phone 7 (WP7) is important to its mobile initiatives as well as to the overall future prowess of the software giant, which is best known for its desktop operating systems and office productivity software. Analysts regard the WP7 announcement as important to the entire company.

"On a scale of 1 to 10, this announcement is an 11" to both Microsoft in mobile and Microsoft overall, said Ramon Llamas, an IDC analyst. "This is where the rubber meets the road. It's huge."

Microsoft must prove it has overcome its dismal performance with the current Windows Mobile OS and the failure of a youth-focused Kin phone line that launched in the spring but was killed two months later. More daunting is how well WP7 can distinguish itself with consumers against iPhone and an array of Android devices, as well as the persistence of Research in Motion's BlackBerry smartphones with the corporate crowd.

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"With WP7, Microsoft is trying to catch up to everyone else in mobile," said Zeus Kerravala, an analyst at Yankee Group. "In many ways, I think they've missed the mobile window, not to play with words. Windows Mobile has left a bad taste in people's mouths and, now, trying to get customers to try Microsoft and WP7 again will be difficult, especially with the popularity of Android and Apple."

Microsoft needs to replace those failed products with a "cool and sleek" set of WP7 devices "that will draw people in," Llamas said. Aside from Microsoft's problems with Kin and its previous Windows Mobile OS, there are other questions over WP7.

Developers, so far, have downloaded more than 300,000 copies of tools to help them build applications. Experts noted that the applications already written for the existing Windows Mobile OS must be heavily rewritten for WP7 and some developers are unhappy about that. While some large third party development houses, such as Travelocity, will build applications for WP7 phones, it's less clear whether small development shops will be able to handle the development process.

"The jury's out," said Paul Reddick, CEO of Handmark, a mobile application developer. "Coming out of this economy, developers don't randomly build stuff."

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