Microsoft confirmed in a blog post that a version of Windows 10 designed for the Raspberry Pi 2 will be available for free following the launch of Windows 10 later this year. Microsoft will release the software via its Windows Developer Program for iOT (Internet Of Things), which already offers a preview version of Windows 8.1 for Intel's Galileo board.
The announcement doesn't necessarily mean you'll be able to deploy multiple Windows 10 Pi devices around the home or office. The conditions for the developer program currently specify that you can only run one copy of Windows licensed through the scheme on your premises at any one time. You're also not supposed to reverse-engineer the code.
Offering free versions of Windows is part of Microsoft's plan to maintain Windows' presence in an increasingly competitive world dominated by mobile platforms, and woo developers to build applications for the platform. Last year, it announced that Windows would be available for free on IoT-devices, as well as on tablets and phones with screens smaller than 9 inches. Upgrading to Windows 10 will also be free for Windows 7 and Windows 8/8.1 owners.
Windows 10 Coming to Raspberry Pi 2 [Building Apps For Windows]