Thousands of apps won't work on new low-end Windows Phones

Microsoft is alerting developers whose apps won't work on the new phones

Microsoft said it has found 5 percent of Windows Phone apps that won't work on devices that adhere to the new system requirements the company released for low-end phones.

On Monday, Microsoft announced that phones with just 256MB of memory and 7x27 processors will be able to run Windows Mobile. Nokia and ZTE are among the first companies to announce phones that will follow the new specification.

While the industry has been referring to this low-end release as Tango in the runup to the announcement, Microsoft has not used the name in blog posts related to the announcement.

Microsoft has now released an early version of the update to the SDK that developers use to build apps for the mobile OS. The updated SDK will let developers run their app in an emulator to determine how the app will operate on the low end devices. A final version of the SDK, which will let developers publish apps, will be available next month, Joe Belfiore, vice president of Windows Phone product management, said in a blog post.

He also said that the company had identified 5 percent of current apps that won't run properly on the lower end devices. Earlier in the day a Microsoft executive said there are currently 65,000 apps available in the market.

The company will contact the developers of those apps to advise them of how to make their apps compatible with the new phones, he said. He also wrote that in most cases the apps would be required to use less memory.

Developers of those apps can also decide not to make their app available to the new phones.

Microsoft also said that it will begin offering the apps Marketplace in 23 new markets in the coming months, including Bulgaria, Iraq, Thailand and Kazakhstan.

Nancy Gohring covers mobile phones and cloud computing for The IDG News Service. Follow Nancy on Twitter at @idgnancy. Nancy's e-mail address is

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