Microsoft officially opened its Windows Marketplace for Mobile application store to software developers on Monday as the giant software maker moves to catch up to the success of Apple's iPhone App Store.

Microsoft is now accepting submissions of mobile phone software applications from registered developers in 29 countries and is offering prizes for the most popular applications as judged by downloads, revenue, usefulness and more, said Todd Brix, leader of Windows Marketplace for Mobile at Microsoft, in a blog posting.

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