Microsoft’s Windows Phone 7 has reached its second milestone, 10,000 applications.

Windows Phone 7 launched on October 26 with 1,000 applications available. Nearly six months later and the platform has increased 10 fold. Microsoft appears to be building up a good momentum amongst application developers. Microsoft says it now has over 32,000 Windows Phone application developers, who deliver an average of 100 new apps per day. The Windows Phone Developer Tools have now been downloaded more than one million times. Microsoft issued an update to developers earlier this week, encouraging them to take advantage of Ad Controls and Trial Use.

Despite delays with its first platform update, “NoDo”, developers have a lot to look forward to this year. Microsoft’s new Nokia partnership is a great opportunity for new and existing developers as more and more consumers take advantage of Windows Phone. Nokia said recently that it plans to ship Windows Phone branded devices to developers when they are avaialble later this year. Nokia is currently engineering Windows Phone devices and is expected to wait for “Mango”, the next version of Windows Phone, until it unveils them later this year. “Mango”, the codename for what will likely be named Windows Phone 7.5, is currently in the early beta stages at Microsoft. The software giant revealed a number of new features in February that will ship as part of its Windows Phone point release later this year. Nokia is reportedly waiting for multitasking, IE9 mobile and others before it releases its first Windows Phone device.

Microsoft will also detail further developer related improvements to Windows Phone 7 during its MIX11 event in April next month. Joe Belfiore, who oversees Windows Phone Program Management, and is responsible for the design and software product definition of forthcoming generations of Windows phones will keynote MIX again. Belfiore will also be joined by Scott Guthrie, who heads Microsoft’s .NET Developer Platform. Guthrie runs the development teams responsible for delivering Silverlight, Visual Studio and the .NET Framework technologies for building client and Web applications. Belfiore is expected to further detail Microsoft’s “Mango” update and other developer improvements.

Microsoft has also promised further developer related platform announcements during May. WinRumors understands that the company plans to share a future roadmap for Windows Phone a special developers day on May 25 in London. Microsoft is describing the event as a peek at the future and what lies ahead for Windows Phone. “As well as new capabilities, we’ll examine any changes to the tools and SDK and explore what opportunities these might create,” says Microsoft. “At this stage we’re unable to elaborate any further but expect it to be a day packed-full of inspiring information.”

Microsoft has officially confirmed that Angry Birds will be available for Windows Phone in Spring. The software giant also confirmed that five other popular games will make their way to Windows Phone in Spring, including Plants vs Zombies and Doodlejump.