) - While developer interest in


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Windows Phone 7 has increased slightly since the software maker announced a partnership with


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, many are still lukewarm on the platform.

Since the deal was made public on Feb. 11, 3% of new app projects started were for Windows Phone 7, compared to just 1% in the week before the announcement, according to mobile app analytics firm Flurry Analytics.

New projects for Windows Phone 7 surpassed that of

Research in Motion's


Blackberry platform, which accounted for 2% of the projects started in the last two weeks.

Nokia CEO Stephen Elop

Windows, which is

powering all new Nokia smartphones

, is trying to catch up with


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iOS and


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Android for smartphone market share.

But while many app developers said their interest in the Windows operating system has grown since the Nokia announcement, they are still hesitant about creating programs for the platform until adoption is proven.

"We're looking at Windows more seriously now because of the new initiative, but we're

waiting on building applications until we get more data on how many people are going to be using these devices," said Alex Moazed, president of Applico, a New York-based mobile development company who has worked with clients like


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While more than 1.5 million Windows Phone 7 devices

were shipped in the first six weeks

of launch, the platform held less than 2% of U.S. market share among smartphone operating systems at the end of 2010, according to industry tracker the NPD Group.

Android grabbed 53% of market share, while Apple comprised 19% of unit sales.

Limited resources are a key deterrent to developing for a platform whose success is still uncertain, said several small-scale app developers.

"While Windows Phone 7 clearly is interesting to us, there are new Android marketplaces continuing to pop up, as well as the launch of the


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iPhone," said Jeff Janer, CEO of Spring Partners in Charlestown, Mass., the creator of productivity app


. "We need to focus on areas where we've already gotten some mindshare and the market share is continuing to increase exponentially."

"I think it'd be taking our eye off the ball to be developing for a new platform that doesn't move the needle for us yet," added Mark DiPaola, CEO of mobile shopping app


in Venice, Calif. "For all the resources we could put on an improved Windows phone, we could make our iOS and Android apps that much better."

CheckPoints might revisit the possibility of developing for Windows in 6 to 12 months, DiPaola said, when there is more visibility into Microsoft's device sales.

Nokia has hinted that it will begin shipping Windows Phones in late 2011.

But despite the uptick in interest among some app developers about the Windows platform, others are less enthusiastic.

"The announcement with Nokia made Windows into a platform we might never ever consider into one we might consider after iOS, Android and after a couple of drinks," said Seth Priebatsch, founder of location-based gaming app


in Cambridge, Mass.

"Windows Phone has received tremendous excitement from the developer community, resulting in well over 8,000 apps, 30,000 registered developers and more than 1 million downloads of Windows Phone Developer Tools," said a Microsoft spokesperson."

--Written by Olivia Oran in New York.

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