Microsoft's Windows Phone 7 has been on the market since November 8 in North America, and it appears as if the device is off to, if not a spectacular, at least respectable start. Today, Microsoft announced that Windows Phone 7 devices sold more than 1.5 million units within six weeks. However, the Redmond, Washington-based company did not indicate how many units had been sold through to consumers.

　　1.5 million units in six weeks is a good start, says Microsoft. As part of an internal interview, Microsoft vice president of business and marketing for Windows Phones Achim Berg emphasized that the company's goal for success in the mobile market is not predicated on short-term sales milestones. He also noted that comparing Windows Phone 7 sales to the competition would be an "apples-to-oranges" effort.

　　"Our numbers are similar to the performance of other first-generation mobile platforms," he said. "We introduced a new platform with Windows Phone 7, and when you do that, it takes time to educate partners and consumers on what you're delivering and drive awareness and interest in your new offering. We're comfortable with where we are, and we are here for the long run; Windows Phone 7 is just the beginning."

　　Windows Phone 7 is currently available on four smartphones in the US: the HTC Surround, Samsung Focus, HTC HD7, and Dell Venue Pro. Microsoft is also cross-promoting Windows Phone 7 with its Xbox brand, beyond the operating system's Xbox Live compatibility. From now until December 31, the company is offering a choice of free Xbox 360 games with all new Windows Phone 7 purchases. Games eligible with the offer are Halo: Reach, Fable III, Kinectimals, and Kinect Joy Ride.