Between January 1, 2011 and June 30, 2011, when you develop and submit a Windows Phone 7 app into the Windows Phone Marketplace, you can be eligible for a chance to win a Windows Phone 7 (approximate retail value: $500 U.S.).

Every valid Windows Phone 7 app you submit will earn you one entry into the Sweepstakes drawing, so the more you develop, the more chances you have to win.

Here’s how it works

1. Register for a Windows Phone Marketplace account
2. Develop an application designed for the Windows Phone 7 platform
3. Upload and publish your app to the Windows Phone Marketplace
4. Fill out the form

You can use code 13VAV on that form.

The Sweepstakes starts at 12:00 a.m. local time, on January 1, 2011, and ends at 11:59 p.m. on June 30, 2011 ("Promotion Period"). The Promotion Period will consist of three (3) separate Entry Periods as follows:

January 1, 2011 – January 31, 2011
February 1, 2011 – March 31, 2011
April 1, 2011 – June 30, 2011

Entries will be eligible for the Entry Period during which they are received only and will not carry over to subsequent Entry Periods. You must enter each Entry Period separately.

For complete contest rules, please visit WindowsPhone7event.com/contestrules.