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Windows Phone Marketplace is a service by Microsoft for its Windows Phone platform that allows users to browse and download applications that have been developed by third-parties.
The Windows Phone Marketplace was launched along with Windows Phone 7 in Oct 2010 in some countries.
It took relatively short, 20 months to reach the magic number (100.000 apps) - that's quicker than Android (24 months), but slower than iOS (16 months)
Here you can see the Windows Marketplace evolution by months.
Out of the 100,000+ submitted apps, 88,371 are available for download across 60 countries. That number is bound to increase with around 300 every day. And if we think better the market is what makes the difference yes?
Source: Wikipedia, GSMarena, Engadget